Across:
8 First goal (first ‘Goal’ = G-) leaves a bad smell in the air (-REEKS) (GREEKS) for Ajax and others (GREEKS),
9 Goes around, for example, 19 down (RING ROAD goes around ‘Athens’), 24 across (‘ring’ = RING) and 24 down (‘road’ = ROAD) (RING ROAD),
10 Beastly type (PUMA) turns (= reversal indicator) up (up = PU-) to graduate (-MA) (PUMA),
11 Truants are (truants are) showing off (= anagram indicator) (truants are = RESTAURANT) in canteen (RESTAURANT),
12 Retiring (= reverse indicator) disc jockey (DJ = J-D), possesses, for example (e.g. = -GE-), two keys (music keys G + A = -AG-) (JAGGED) with rough sharp pointy bits (JAGGED),
14 What one might ask a man of the cloth to do (turn coat = TURNCOAT) for Judas? (TURNCOAT),
15 Most of those in 8 across (most ‘Greeks’ = GREEK) and 11 across (‘restaurant’ = RESTAURANT) (GREEK RESTAURANT) in The Taverna (GREEK RESTAURANT)
18 Old wine (old white wine = SACK) people (RACE) (SACK RACE) in a childish game where the loser is left holding the bag perhaps (SACK RACE),
20 Artist’s impression (DESIGN) of tragedians sacrificing a rat (‘tragedians’ sacrificing ‘a rat’ = gedins = DESIGN),
22 Sports ground (tennis/squash COURT-) similar to 17 down (-HOUSE is similar to ‘audience’) (COURTHOUSE) where you’d expect to see action (legal action / COURTHOUSE),
24 The sound of the mobile (RING) wedding band (RING),
25 Tramline (tramline) meandering (= anagram indicator) (tramline = TERMINAL) to station (TERMINAL),
26 One drink after another (CHASER) for a jumpy Arabian perhaps (Arabian horse / CHASER).
Down:
1 Crafty type (art = TRA-) retires (= reversal indicator) from Russian body (Duma) – losing a leader (d) (‘Duma’ losing ‘d’ = -UMA) (TRAUMA) comes as a shock (TRAUMA),
2 Some revolutionary (= reverse indicator) characters grateful (some revolutionary characters ‘grATEFul’ = atef = FETA) one of those from 15 across brought on board? (one of those from ‘Greek Restaurant’ brought FETA on cheeseboard),
3 Employ speed-reader perhaps (USE RADAR) to take liberties with (USE) advertisement (-AD-) after (= position indicator) writing (from the 3Rs = R-) introductions and reassessments (introductions ‘And Rechecking’ = -AR) (USE RADAR),
4 They get fired by a major supplier (ARMS) for concealing what’s in farm subsidies (concealing what’s in ‘fARM Subsidies’ = ARMS),
5 It’s not just (UNFAIR) below the belt (UNFAIR),
6 Get ready to work in the kitchen (prep) cutting (p) (‘prep’ without ‘p’ = PRE-) potatoes (type of potatoes = -RECORDS) (PRERECORDS) or those in the can? (PRERECORDS),
7 Support (MAINTAIN) American state (Maine) report (= homophone indicator) (‘Maine’ = ‘main’ = MAIN-) that’s epic, in a local literary sense (Táin Bó Cúailnge = -TAIN) (MAINTAIN),
13 A darker gem (a darker gem) produced (= anagram indicator) (a darker gem = GREEK DRAMA) in the equivalent of the abbey (The Abbey Theatre) in 19 down (GREEK DRAMA in Athens),
14 Try (TASTE) to tidy head (‘Tidy’ head = T-) on cut (r) flower (aster) (‘aster’ without ‘r’ = -ASTE) (TASTE),
16 A (-A-) relative (-SON-) consumed by grass (reed = RE-ED) (REASONED) is well presented (REASONED),
17 The Spectator’s (The Spectators = AUDIENCE) formal interview with politician (AUDIENCE),
19 One-time state (ATHENS was a state in the past) provided home for citizens in 8 across (ATHENS home for ‘Greeks’),
21 Turns up (= reverse indicator), local doctor (rig = GI-R) consumes, for example (e.g. = -GE-), top-notch (top ‘Notch’ = -N-) (GINGER) spice (GINGER),
23 Angry (= anagram indicator) guy (guy = UG-Y) crossing the line (-L-) (UGLY) is not much to look at (UGLY),
24 It’s covered up by Politburo administration (ROAD covered up by ‘politbuRO ADministration’), by the way (ROAD).