Perhaps not as difficult (for an IoS puzzle) as in recent weeks. Thanks to Hypnos. Definitions are underlined in the clues.
Across
1 Local left in charge of a community (6)
PUBLIC : PUB(one that could be your local, a favourite watering place near your home or place of work) + L(abbrev. for “left”) + I.C.(abbrev. for “in charge”).
4 Indication GP is not working after Sunday (8)
SIGNPOST : Anagram of(… working) GP IS NOT placed after(after) S(abbrev. for “Sunday”).
9 Discover gang fight in New York? (6)
RUMBLE : Double defn: 1st: A British term for “to discover”; and 2nd: An American term for a gang fight.
10 Film was screened, hosted by one in club mostly (8)
MEMBRANE : RAN(was screened, as in “the film ran at the Odeon for 4 weeks”) contained in(hosted by) “member”(one belonging to a club) minus its last letter(… mostly).
11 Record latest of poor shoddy diet in bad repute (9)
DISCREDIT : DISC(a record to be played on a player) + the last letter of(latest of) “poor ” + anagram of(shoddy) DIET.
13 A hint about temperature that’s keenly perceptive (5)
ACUTE : A + CUE(a hint;a guiding suggestion) containing(about) T(abbrev. for “temperature”).
14 Information journalist found in change of name for actor (4,7)
GENE HACKMAN : GEN(information;the lowdown) + [ HACK(an uncomplimentary term for a journalist) contained in(found in) anagram of(change of) NAME].
18 Mark retirement of former student beside unrefined resort (11)
SCARBOROUGH : SCAR(a mark from, say, an old wound) + reversal of(retirement of) O.B.(abbrev. for “old boy”;a former student) plus(beside) ROUGH(unrefined).
Defn: … on the coast of North Yorkshire, England.
21 Excuse current in French town (5)
ALIBI : I(symbol for an electric current in physics) contained in(in) ALBI(a town in Southern France).
22 Writer with aim to appear in dictionary that’s adaptable (4-5)
OPEN-ENDED : [ PEN(a writing instrument) plus(with) END(an aim;an objective) ] contained in(in) O.E.D.(abbrev. for the Oxford English Dictionary).
24 I bet a fancy motor racing company’s head is supremely happy (8)
BEATIFIC : Anagram of(… fancy) I BET A + FI(abbrev. for Formula One, the motor racing sport, with the numeral Romanised) + the 1st letter of(…’s head) “company“.
25 Drunkard creates pong emptying bottles (6)
SPONGE : Hidden in(… bottles) “creates pong emptying “.
26 Hear agricultural implement is picked up in wheeled transport (8)
TRICYCLE : Homophone of(… is picked up) [ “try”(to bring to court;to hear a case) + “sickle”(an agricultural equipment) ].
27 Liable to crash? (6)
SLEEPY : Cryptic defn: To crash out is to fall asleep from exhaustion.
Down
1 Inspector in corporate get-together following normal example (8)
PARADIGM : [ D.I.(abbrev. for “detective inspector”) contained in(in) A.G.M.(abbrev. for the Anual General Meeting of the shareholders of a corporation) ] placed below(following, in a down clue) PAR(the normal value;the standard).
2 Like a puzzle Greek character in training begins (8)
BEMUSING : MU(the 12th letter of the Greek alphabet) contained in(in) anagram of(training) BEGINS.
3 Singing comedienne blowing top, one averse to work (5)
IDLER : “Midler”(Bette, the American singer and comedienne) minus its 1st letter(blowing top).
5 Priceless item in Basel damaged (11)
INESTIMABLE : Anagram of(… damaged) ITEM IN BASEL.
6 Breeze and wet weather in much of Borneo sadly (2-7)
NO-BRAINER : RAIN(wet weather) contained in(in) anagram of(… sadly) “Borneo ” minus
its last letter(much of …).
Defn: An easy task or choice requiring little thought, one you would breeze through.
7 Unintelligible work, one somewhat devoid of appeal (6)
OPAQUE : OP(abbrev. for “opus”;a musical work) + A(one;singular) + “quite”(somewhat;to a notable extent) minus(devoid of) “it”(sex appeal).
8 Like some parties in classic holiday area (6)
THEMED : [THE MED](the classic European holiday area to get sun, sand, and sea).
Defn: Descriptive of some social occasions, eg. a toga party.
12 Overbearing police turned up on time with a round figure in case (11)
DICTATORIAL : Reversal of(… turned up) C.I.D.(abbrev. for the Criminal Investigation Department in the police force) + T(abbrev. for “time”) plus(with) + [ O(a round figure) contained in(in) TRIAL(a court case) ].
15 Antagonism? It’s possibly settled in Scottish island (9)
HOSTILITY : [ Anagram of(… possibly) IT’S + LIT(settled on;landed on) ] contained in(in) HOY(one of the Orkney Islands in Scotland).
16 Fellowship left out by a Northern church for instruction (8)
GUIDANCE : “guild”(a fellowship;an association) minus(… out) “l”(abbrev. for “left”) plus(by) A + N(abbrev. for “northern”) + CE(abbrev. for the Church of England).
17 Be quiet like a cow – or prone to trembling? (8)
SHUDDERY : SH(an interjection for someone to be quiet) + UDDERY(whimsical description of a cow, mammary glands and all).
19 Good scope for opening comment (6)
GAMBIT : G(abbrev. for “good”) + AMBIT(scope;range, eg. of one’s power or control).
Defn: … to secure an advantage or promote a point of view.
20 Artist capturing female group on rise in religious festival (6)
DIWALI : DALI(Salvador, Spanish surrealist artist) containing(capturing) reversal of(… on rise, in a down clue) W.I.(abbrev. for the Women’s Institute).
Defn: … of the Hindus.
23 Possibly remove from club old footballer lacking energy (5)
EXPEL : EX-(suffix denoting old;former) + “Pele”(former Brazilian footballer) minus(lacking) “e”(symbol for “energy” in physics).
Nothing really difficult; didn’t know about New York gang fights. A few words went in from crossing letters and only after seeing them in the grid did the parsing become apparent, e.g. DIWALI.
Thanks, Hypnos and scchua.
Thanks Hypnos and scchua.
I did not know about the New York gang fights either. I liked the’ unrefined resort’! I guess many North Yorkshire people now go to ‘the Med’. Actually, the photos of Scarborough on the web look rather inviting.
typo 21a, ALBI.
Obviously no-one has seen West Side Story, the end of Act 1 is actually called the Rumble. 🙂