Across:
1 There’s no spirits in Corpus Christi (there’s no ‘spirits’ in ‘Corpus Christi’ = coruch = CROUCH) squat (CROUCH),
4 Substituting (SWAPPING) small (S-) rugby player (W-ING) over attacking pugnacious props, for starters (‘attacking pugnacious props’ for starters = -APP-) (SWAPPING),
9 Was a huge success (MADE IT) in Media (Media = MADE I-) developing (= anagram indicator) end product (end ‘product’ = -T) (MADE IT),
10 The job of the drug dealer (DISPENSE) to give out (DISPENSE),
12 Offer opportunity for someone working on The Wire (working on the wire/electrician = BLOW A FUSE) with freak (BLOW A FUSE),
13 Challenges (DARES) some characters from fundraiser advocating (some characters from ‘fundraiser advocating’ = serad) review (= reversal indicator) (serad = DARES),
14 Selling specialist foods (DELICATESSEN) is almost (e) dainty (‘delicate’ without ‘e’ = DELICAT-) in Ruhr valley (-ESSEN) (DELICATESSEN),
18 Gaffe-prone (UNDIPLOMATIC) peacekeepers (United Nations = UN-) linked to foreign representative (-DIPLOMAT-) in charge (-IC) (UNDIPLOMATIC),
21 Light-footed (AGILE) barman (Attorney General = AG-) loses head (f) in row? (row/line = ‘file’ without ‘f’ = -ILE) (AGILE),
22 Drinks (COCKTAILS) with one of the birds (COCK-) from A-list (A-list = -TAILS) (COCKTAILS) models (= anagram indicator),
24 Church (CH-) woman (-ANNE-) left (-L-) school (-S) (CHANNELS) for The Stations (CHANNELS),
25 Handy position (AKIMBO) for sailor (able-bodied seaman = A-B-) taking in Kipling’s novel (Rudyard Kipling’s Kim = -KIM-) from books’ centre (‘books’ centre = -O) (AKIMBO),
26 One (I-) top midfielder (top ‘midfielder’ = -M-) and retiring (-MODEST) (IMMODEST) forward (IMMODEST),
27 Took off (ran) back (= reversal indicator) (ran = -NAR-) to Loop Head (‘Loop’ Head = -L-) in ship (S-S) (SNARLS) with a few grumbles (SNARLS).
Down:
1 Caught (C-) Band Aid (-AMP) at Debs (Debs = BEDS) Dance (= anagram indicator) (CAMP BEDS) for loungers on holiday (CAMP BEDS),
2 A traditional place where nothing much changes (OLD WORLD) in Oxford (O-), around (= reversal indicator) Donegal (DL = -LD), Waterford (W-) and alternatively (-OR-) Longford (-LD) (OLD WORLD),
3 Capuchin drops cup (‘Capuchin’ drops ‘cup’ = achin = CHINA) of high-quality porcelain (CHINA),
5 The problem is, columnist can’t put down memoir (WRITER’S BLOCK) of the journalists’ bar? (WRITER’S BLOCK),
6 Fantasy (PIPE DREAM) of one of those with great expectations (PIP from Charles Dickens’ Great Expectations) working as a journalist (ed = -E D-) for a lot of papers (-REAM) (PIPE DREAM),
7 Don’t bring any attention to (IGNORE) Gore in (Gore in = IGNORE) trouble (= anagram indicator),
8 Sugar beet excludes tub (‘sugar beet’ excludes ‘tub’ = sgaree = GREASE) of fat (GREASE),
11 Sunblock (CURTAIN) for The Bellows (CALLS) (CURTAIN CALLS) – the ones demanded by the people at play (CURTAIN CALLS),
15 Journalist (-ED) behind (= position indicator) non-government agency (CONCERN-) (CONCERNED) is ill at ease (CONCERNED),
16 Initially slimmer (initially ‘slimmer’ = S-) and fitter (-TRIMMER) (STRIMMER) from cutting down on the grass (STRIMMER),
17 Old Bob (old ‘bob’ = shilling = S-) can be woefully (= anagram indicator) cross (cross = -C-SSOR-) about one (-I-) skinhead (‘skin’ head = -S) (SCISSORS) employed by the barbers (SCISSORS),
19 College (C-) in Haiti (Haiti = TAI -HI) adapted (= anagram indicator) (TAI CHI) exercises for the Orientals (TAI CHI),
20 Take the sting out of the tail (DISARM) with charm (charm/beguile = DISARM),
23 Car taken from one track (‘car’ taken from ‘one track’ = onetk = TOKEN) as a memento (TOKEN).