Across:
1 Consequence of taking useless drugs in The Trial? (PLACEBO EFFECT) As a phenomenon, it only profits the sugar producers presumably! (sugar pills used in placebo pills / PLACEBO EFFECT),
10 Doesn’t know what one is doing (LO-ST) securing type of blood (-B- blood group) in hospital (-ER) (LOBSTER) for crabby relative (LOBSTER),
11 Gangster (-AL- Capone) in Wales (Wales) swimming (= anagram indicator) (Wales = SEAW-L) (SEAWALL) from ocean container? (SEAWALL contains ocean/ocean container),
12 The horsey (COLT) set on the edges of commuter belt (set on the edges of ‘COmmuter beLT’ = COLT),
13 Convey (CARRY) to Bellow (cry = C-RY) concealing note (music note -A-) on writing (from the 3Rs = -R-) (CARRY),
15 Soft mineral (TALC) concealed by Marc Latimer (concealed by marC LATimer = clat) in a roundabout way (= reverse indicator) (clat = TALC),
17 Flower (flower/river LEE) found in Middle East (found in ‘middLE East’ = LEE),
19 Know all (know-all = ORACLE) the old (O-) Irish people, for instance (race = -RAC-E), around Limerick (-L-) (ORACLE).
21 Trade Union (TU-) to vote (-X-) to join English (-E-) party (-DO) (TUXEDO) – coming from the rag trade this is rather formal (TUXEDO),
22 Type of exercise (AEROBIC exercise) leading to Texan leaving out of exacerbation (‘Texan’ leaving out of ‘exacerbation’ = cerbaio = AEROBIC),
23 Spacewalker missing Wales (‘spacewalker’ missing ‘Wales’ = pacekr = REPACK) gets to put clothes back in suitcase again to go home (REPACK),
25 Serves up (= reverse indicator) a (-A-) lime topping/ (‘Lime’ topping = -L-) /filling in rice (rice = EC-IR) (ÉCLAIR) cake (ECLAIR),
27 Among those characters in speed dating (among those characters in ‘speeD DAting’ = dda) falling head over heels (= reverse indicator) (dda = ADD) with Count (count = ADD),
29 Fridges with no red (fridges’ with no ‘red’ = figs = FIGS) tropical fruit (FIGS),
30 Barges in losing rag (‘barges in’ losing ‘rag’ = besin = IBSEN) with writer associated with the pillars of society (“The Pillars of Society” by Henrik IBSEN),
31 Local jam (cram) served up (= reverse indicator) (cram = MARC) with alcoholic spirit (MARC),
34 It’s passed on by ancestors (gene = GEN-E) around university (National University of Ireland = -NUI-) (GENUINE)? That’s true! (GENUINE),
35 Epic (epic) novel (= anagram indicator) (epic = P-CIE-) about King of Ireland (King of Ireland = Rí = -RI-) is first rate (first ‘Rate’ = -R) (PRICIER) and more expensive (PRICIER),
36 They’re put out by those waiting (PLACE SETTINGS put out by waiters) or working in the crossword business (SETTING-) in various locations (PLACE -S) (PLACE SETTINGS).
Down:
2 Plant (LOBELIA) lots of broccoli heads ('Lots Of Broccoli' heads = LOB-) in spring (= anagram indicator)? A lie! (a lie = -ELIA) (LOBELIA),
3 Quote (CITE) from Washington (city), briefly (y) (‘city’ without ‘y’ = CIT-), close to Delaware (close to ‘delawarE’ = -E) (CITE),
4 The end of the line (BURIAL) for British (B-) wild sheep (-URIAL sheep) (BURIAL),
5 Guard (guard/secure = ENSURE) loses the head (c) with official rebuke (censure) (‘censure’ without ‘c’ = ENSURE),
6 Some still-life artists (some ‘still liFE ARtists’ = FEAR) with cold feet (FEAR),
7 It’s an absurd pretence (CHARADE) for Henry (-H-) joining up (= reverse indicator) with Dara (Dara = -ARAD-) in Clare (CE = C-E) (CHARADE),
8 A safe location (PLACE OF REFUGE) for a church offering sanctuary in the past, for example (PLACE OF REFUGE),
9 Officially talk to a journalist (PLACE ON RECORD) in a loud (aloud = homophone indicator) fish (‘plaice’ = ‘PLACE’) joint – even (‘jOiNt’ even = ON) for most of those in 14 down (most of ‘records’ = RECORD) (PLACE ON RECORD),
14 Spud’s (spuds/potatoes = RECORDS) similar to 32 down (‘disc’ similar to RECORD-) at school (-S) (RECORDS),
16 Position (PLACE) on all sides today (PLACE on four sides of today’s crossword),
18 Unknown quantity (Y-) at college (University College Cork = -UCC-) lead with anthem (lead with ‘Anthem’ = -A) (YUCCA) from The Joshua Tree (Joshua tree = YUCCA),
20 Panic from peacenik (‘panic’ from ‘peacenik’ = eek = EEK) or so she said when he saw a mouse (EEK),
21 One of The Windsors (Windsor TIE) raised (= reverse indicator) in Leitrim? (in ‘lEITriml = eit = TIE),
24 Lost (= anagram indicator) again (again = -AGINA-) in place (PL = P-L) (PAGINAL) describing leaves of a particular type (PAGINAL describes leaves/pages),
26 Shocking (AMAZING) twisted (= anagram indicator) Nazi mag (Nazi mag = AMAZING),
27 Flipping (= reverse indicator) crafty type (ship = SS= -SS) on Elba (Elba) replaces novice (learner = ‘l’) with bishop (‘b’) (in ‘elba’, replace ‘l’ in with ‘b’ = ebba = ABBE-) (ABBESS) – the one running convent (ABBESS),
28 Penny (penny = D-), Earl (-E-) and Mark (-SPOT) (DESPOT) Cromwell, for example (DESPOT),
32 Considers releasing Norse (‘considers’ releasing ‘Norse’ = csid = DISC) record (DISC),
33 Horrified losing order (‘horrified’ losing ‘order’ = hifi = HI-FI) for sound system (HI-FI).