Across:
1 Coach (bus = SUB-) retires (= reversal indicator) and opens warehouse and yard (opens/first letters of “warehouse and yard” = -WAY) (SUBWAY) by underpass (SUBWAY),
4 Wild (= anagram indicator) star (star = ART-S) secures job (-WORK-) (ARTWORKS) in the museum (ARTWORKS),
9 Take care leaving casseroles (take “care” leaving “casseroles” = ssoles = LOSSES) for casualties (LOSSES),
10 Mice pass (mice pass = ESCAPISM) contamination (= anagram indicator) for those living the dream (ESCAPISM),
12 Perhaps this might have crossed your mind (HEADPIECE) illustratively opening a chapter (HEADPIECE),
13 Drowns out newsvendors (“drowns” out from “newsvendors” = evens = EVENS) – what’s the odds of that! (betting odds could be EVENS),
14 Crazy (= anagram indicator) modern truths (modern truths = THUNDERSTORM) from natural disturbance (THUNDERSTORM),
18 Has a job on location (EXTRA-) with Virginia (-VA-) getting direction (north = -N-) in Mediterranean strip (Gaza Strip = -GA-ZA) (EXTRAVAGANZA) show (EXTRAVAGANZA),
21 Gradually destroy (ERODE) drugs (E+E = E-E) found on both sides of bar (bar = -ROD-) (ERODE),
22 It’s a game of patience (card game “patience” = SOLITAIRE) giving out (= anagram indicator) to Israeli (to Israeli = SOLITAIRE),
24 French (F-) play (-ACT-) owes debt (IOUs = -IOUS) (FACTIOUS) to dissident (FACTIOUS),
25 Spring (spring/jump = CAVORT) dance (dance/jig = CAVORT),
26 Recently developed (NEW-) top lawn (top/first letter of lawn = -L-) is moist in the morning (dewy = -YWED), upsetting (= reversal indicator) (NEWLYWED) one of those at the recent match (NEWLYWED),
27 What’s the explanation (LEGEND) for stage (LEG-) finish? (-END) (LEGEND).
Down:
1 In addition to (plus = SULP-) falling over (= reversal indicator), can’t stand (-HATE) SULPHATE) coming out of the salt mine perhaps (SULPHATE),
2 Nearly die laughing at (BUST A GUT) sculpture (BUST) at the bar (Attorney General = A G = A G-) from dump (put) with no head (p) (“put” without ‘p’ = -UT) (BUST A GUT),
3 Finished off (ATE UP) in a (A-) backward (= reversal indicator) place (put = -T- UP) around Spain (-E) (ATE UP),
5 Rotten (= anagram indicator), vilest, creepy (vilest creepy = RESPECTIVELY) type that relates to everything already mentioned (RESPECTIVELY),
6 Develop runner (WEAVE A RUG) to move in and out of (WEAVE) a really useful group of leaders (a really useful group of leaders/first letters = A RUG) (WEAVE A RUG),
7 Made a mess of (RUINED) Downfall (downfall = RUIN-) with English (-E-) director (-D) (RUINED),
8 Rings Samaritans for Rosa (rings/surrounds ‘Samaritans for Rosa’ = SAMOSA) from Indian restaurant (SAMOSA),
11 Contemporary influence (PEER PRESSURE) of Lord (PEER) Harry (harry/harass = PRESSURE) (PEER PRESSURE),
15 Exited – try (exited try = DEXTERITY) criminal (= anagram indicator) for sleight of hand (DEXTERITY),
16 First (A-) short record (-N-OTE) about rebellious (= reversal indicator) college (Dublin Institute of Technology = DIT = -TID-) (ANTIDOTE) produced by The Cure (ANTIDOTE),
17 Gifted (TALENTED) story (TALE-) to good books’ (New Testament = -NT) editor (-ED) (TALENTED),
19 Really turn up the sound (DEAFEN) as Daniel Defoe is ignoring oldie (“Daniel Defoe” is ignoring “oldie” = danefe = DEAFEN),
20 Comes down without Ned (“comes down” without “Ned” = comsow = MOSCOW) to foreign capital (MOSCOW),
23 React (react = TRACE) badly (= anagram indicator) to imprint (TRACE).