Across:
1 Hit (THRUST) for Elbow? (elbow/shove = THRUST),
4 Denied (DISOWNED) detectives (DI’s = DIS-) could be possessed (-OWNED) (DISOWNED),
9 Explained (SOLVED) doves (doves = SO-VED) flying (= anagram indicator) around lake (-L-) (SOLVED),
10 What weather person discovered (THE FRONT), a major employer is expected to attack (a major employer = the army to attack = THE FRONT),
12 State support (TAX CREDIT) accumulated by Revenue (TAX) generates a lot of interest (CREDIT) (TAX CREDIT),
13 A last (a last = ATLAS) resolution (= anagram indicator) covers the world (ATLAS),
4 Take The Liberties (BEND THE RULES) to not follow procedure (BEND THE RULES),
18 Nearly all (s) of the fresh intelligence (“news” without “s” = NEW) is evidence (TESTAMENT) (NEW TESTAMENT) of good books (NEW TESTAMENT),
21 Turns up (= reversal indicator), he (he = E-H) sheltered officer (cop = -POC-) (EPOCH) from the division – in time (the division in time = EPOCH),
22 Regiment (R-) with a foreign (a = -EIN-) police agency (-FORCE) (REINFORCE) for back-up (REINFORCE),
24 Wild party (CAROUSAL) for the little drummer boy (“The Little Drummer Boy” or “Carol of the Drum” = Christmas CARO-L) going around America (-USA-) (CAROUSAL),
25 Edward left overshadowed (“Edward” left “overshadowed” = ovshoe = HOOVES) by those supporting the Arabians (supporting the Arabians/horses = HOOVES),
26 It’s awkward (PERVERSE) for a gent (a gent = agent = rep = PER-) raising (= reversal indicator) bit from the Bible (-VERSE) (PERVERSE),
27 Bought and sold (TRADED) turkey (Turkey domain = .tr = TR-) – it’s dead (dead = -ADED) special (= anagram indicator) (TRADED),
Down:
1 Measure (TEST) pipe (TUBE) (TEST TUBE) for experimental purposes (TEST TUBE),
2 Resistance (R-) to the Spanish (the = -EL-) getting rid of (-AXING) (RELAXING) those taking it easy (RELAXING),
3 Drive (STEER) out of wild (= anagram indicator) trees (trees = STEER),
5 Following closely (IN HOT PURSUIT) fashionable (IN) and popular (HOT) hobby (PURSUIT) (IN HOT PURSUIT),
6 Switch (OFF) a cream (a cream = CAMERA) pie (= anagram indicator) (OFF CAMERA) when no one’s looking (OFF CAMERA),
7 Local fool (NOODLE) with no dole (no dole = NOODLE) arrangement (= anagram indicator),
8 Feel animosity (DETEST) to writer (ed = DE-) reviewing (= reversal indicator) trial (-TEST) (DETEST),
11 Starved (starved = ADVERT-S) criminal (= anagram indicator) found around old (-O-) Arabian capital (Arabian capital/money = -RIAL-) (ADVERTORIALS) could be state-sponsored work, characteristic of the times (could be state-sponsored work, characteristic of The Times newspaper = ADVERTORIALS),
15 Accommodates the children (TREE HOUSE) in The Cherry Orchard (TREE) getting near the audience (HOUSE) (TREE HOUSE),
16 Legal document (DE-ED) covering half (half) the soldiers (half the “privates” = -PRIV-) (DEPRIVED) is poor (DEPRIVED),
17 It must be said time and time again (STRESSED), this has already been highlighted (STRESSED),
19 One of the Greens is found here (green tea found in TEACUP) offering predictions perhaps (tea leaves offering predictions perhaps in TEACUP),
20 Little devil (HORROR) from The Bride of Frankenstein, for example (Bride of Frankenstein = HORROR film),
23 Nuclear fusion without the nuisance (“nuclear fusion” without the “nuisance” = lrfuo = FLOUR) of powdery substance in the mix (FLOUR).