Across:
1 No gold in grand total (no “gold” in “grand total” = rantta = TARTAN) for the man of the cloth (TARTAN),
4 Barman (attorney general = AG-) finds it (-IT-) can be a support (-PROP) (AGITPROP) from political propaganda (AGITPROP),
9 Candy (SWEETS) Snider leaves the dessert wines (‘snider’ leaves the ‘dessert wines’ = setwes = SWEETS),
10 Give it one’s best shot (STRUGGLE) with horse (-GG-) in Ulster (Ulster = STRU-LE) run (= anagram indicator) (STRUGGLE),
12 Go into hiding (TAKE COVER) with Nick (TAKE) from Cobh (“Cobh” = “cove” = COVE-), in a manner of speaking (= homophone indicator), at end of the war (end of ‘war’ = -R) (TAKE COVER),
13 Accommodate (HOUSE) uranium (-U-) in spray (HO-SE) (HOUSE),
14 That one who never stops going on and on (BROKEN RECORD) shattered (BROKE-) by new (-N) personal best (RECORD) (BROKEN RECORD),
18 American (A) splitting hairs (PARTING) got the bullet (SHOT) (A PARTING SHOT) for last retort on the way out (A PARTING SHOT),
21 Instrument (PIANO) for pain (pain = PIAN-) management (= anagram indicator) osteopath introduced (‘osteopath’ introduced = -O) (PIANO),
22 Instructor (TUTOR-) gets to sail (sail = -IALS) out (= anagram indicator) (TUTORIALS) of classes (TUTORIALS),
24 What the detective is looking for (EVIDENCE) is supplied by court reporter perhaps? (EVIDENCE supplied by court reporter perhaps / eye witness),
25 Pictures (CINEMA) of spies (CI-A) locking up (= reversal indicator) lads (lads = men = -NEM-) (CINEMA),
26 The big pitch (HARD SELL) is tough as old boots (HARD) to deal with (SELL) (HARD SELL),
27 Note (music note -E-) in case (C-ASE-) director (-D) (CEASED) quit (CEASED).
Down:
1 Pilot (TEST) from Bath (TUB-), England (-E) (TEST TUBE), is observed under laboratory conditions (TEST TUBE),
2 Free (free = REEF) jazz (= anagram indicator) joint (KNOT) (REEF KNOT) is used by sailors in a bind for a quick release (REEF KNOT),
3 Old Mexican (AZTEC) is dour leaving Côte d’Azur (‘dour’ leaving ‘Côte d’Azur’ = cteaz = AZTEC),
5 Notes (money) taken at theatrical venue perhaps (GATE RECEIPTS) handed over by those in attendance (GATE RECEIPTS),
6 Putting an end to the lies (TRUTH DRUG), politician (T-D) admits treatment (= anagram indicator) hurt (hurt = -RUTH) one of the runners (-RUG) (TRUTH DRUG)
7 Hardship (RIGOUR) of most of (t) the outfit (‘rigout’ without ‘t’ = RIGOU-) from regiment (-R) (RIGOUR),
8 Bits (PIECES) he’d removed from cheese dip (‘hed’ removed from ‘cheese dip’ = ceseip = PIECES),
11 Casanova (lover) loses the head (l) (‘lover’ without ‘l’ = OVER-) with serious (serious = -CRITICAL) (OVERCRITICAL) type that’s hard to please (OVERCRITICAL),
15 Study (EXPLORE-) writing and reading (from 3Rs: R + R = Rs = -RS) (EXPLORERS) by the scouts (EXPLORERS),
16 Cold (C-) series of radiators (-HEATERS) (CHEATERS) – you can play with them but you won’t get the better of them (CHEATERS),
17 In the interests of leader’s (‘in the interests’ of leaders = IT I-) support (-AID) behind (= positional indicator) old paramilitaries (SS = -S S-) (IT IS SAID) or so the story goes (IT IS SAID),
19 Address (SPEECH) most of (d) the drugs (‘speed’ without ‘d’ = SPEE-) coming from Switzerland (-CH) (SPEECH),
20 Engineering (E-) a (-A-) bizarre (= anagram indicator) rise (rise = -SIER) (EASIER) is getting less difficult (EASIER),
23 Lift (RAISE) is (-IS-) in the middle of elevated (= reversal indicator) space for The Hearing (ear = RA-E) (RAISE).