Across:
1 Graduate (MA= M-A) takes in a (-A-) trail (-LAG-) (MALAGA) from Iberian port (MALAGA),
4 Tree (ash = A-SH) overlooking street (-ST-) and tops of neighbourhood including (tops ‘Of Neighbourhood Including’ (-ONI-) (ASTONISH) a maze? (‘a maze’ = ‘amaze’ = ASTONISH),
9 Channel synonymous with The House (GUTTER) Government- (G-) -speak (-UTTER) (GUTTER),
10 Ridicule (CONTEMPT) criminal (CON-) and part-time worker (-TEMP-) starting trouble (starting ‘Trouble’ = -T) (CONTEMPT),
12 Gruff (hoarse) on the radio (= homophone indicator) (‘hoarse’ = ‘horse’ = HORSE-) programme (-SHOW) (HORSESHOW) with competitive jumpy type (HORSESHOW),
13 To be sure, without BSE (‘to be sure’, without ‘BSE’ = toure = OUTRÉ), it’s weird to the French? (weird/eccentric = OUTRÉ),
14 Champions (TORCHBEARERS) those unlikely to be dropped going to the Olympics? (TORCHBEARERS carrying ‘Olympic torches’ to Olympic Games),
18 Christian (PRESBYTERIAN) unsettles (= anagram indicator) nearby priest (nearby priest = PRESBYTERIAN),
21 Class (RANGE) of Orangeman disregarding moan (‘orangeman’ disregarding ‘moan’ = rgean = RANGE),
22 Romanians (Romanians) travelling (= anagram indicator) (Romanians = SAN MARINO) to small European republic (SAN MARINO),
24 One of the issues (DAUGHTER) produced by (= anagram indicator) The Guard (The Guard = DAUGHTER),
25 Nothing (-O-) in The Cherry Orchard, for one (grove = GRO-VE) (GROOVE), is cut in the material sense (GROOVE),
26 Nuts and bolts (ELEMENTS) for workers (-MEN-) in steel (steel) production (= anagram indicator) (steel = ELE-TS) (ELEMENTS),
27 In the neighbourhood (CLOSE-) restaurant – the ultimate (restaurant the ‘ultimatE’ = -T) (CLOSET) secret (CLOSET).
Down:
1 Local fool (local fool = MUG-) with photographs (-SHOTS) (MUGSHOTS) of rogues’ gallery taken by the police (MUGSHOTS),
2 It rarely (it rarely = LITERARY) worried (= anagram indicator) academic (LITERARY),
3 Rant from teenagers (‘rant’ from ‘teenagers’ = eeges = GEESE) in a gaggle (GEESE),
5 Chill (STOP WORRYING) those holding stock, for instance (pots), served up (= reverse indicator) (pots = STOP) in a stew (WORRYING) (STOP WORRYING),
6 Use external company (OUTSOURCE) to expose (OUT-) a gent’s confidant (‘a gents’ = ‘agents’ confidant- = SOURCE) (OUTSOURCE),
7 Convict (INMATE) at one time lost toe (‘at one time’ lost/without ‘toe’ = atnime = INMATE),
8 Contract workers perhaps (HIT MEN) losing rag in nightmare (losing “rag” in “ nightmare” = nihtme = HIT MEN),
11 The Boys in Blue think he did it (CHIEF SUSPECT) for manager (CHIEF) and that’s not quite right (that’s SUSPECT) (CHIEF SUSPECT),
15 Get lost (shoo), in a manner of speaking (= homophone indicator) (‘shoo’ = ‘shoe’ = -SHOE), after (= positional indicator) opening 12 across (opening ‘horse shoe’ = HORSE-) (HORSESHOE) – some would say that’s lucky (HORSESHOE),
16 One (-I-) car (model -T-) coming in light shades (VIS-ORS) (VISITORS) not familiar to the locals (VISITORS),
17 Is not guilty (INNOCENT) of selling drink (INN-) from old (-O-) capital (capital/money = -CENT) (INNOCENT),
19 Connection (BRIDGE) to James Joyce in Dublin, for instance (James Joyce BRIDGE),
20 Bear (ENDURE) or swallow? (ENDURE),
23 Laura (Laura) plays (= anagram indicator) (Laura = AURAL) acoustic (AURAL).