Across:
1 They could be civil (civil RIGHTS) to all those at the end of 11 down (end of ‘mining rights’ = RIGHTS),
4 Polynesian island group (Samoa = SAMO-A-) conceals five (Roman five = -V-) tips from respected society (tips from ‘Respected Society’ = -RS) (SAMOVARS) of Russian brewers? (Russian tea urns = SAMOVARS),
9 Gems for Middle Ages (‘gems’ for ‘Middle Ages’ = iddlea = LADDIE) produced by young man from Scotland (LADDIE),
10 Absolved of all blame (FORGIVEN) by open verdict (open ‘Verdict’ = -V-) in foreign (foreign) action? (= anagram indicator) (foreign = FORGI-EN) (FORGIVEN),
12 Iconic queen (NEFERTITI) of Sultan ignored by first lieutenant (‘Sultan’ ignored by/without ‘first lieutenant’ = firietent = NEFERTITI),
13 Sister (NURSE) runs (runs) off (= anagram indicator) (runs = NURS-) with sweetheart (‘swEet’ heart = -E) (NURSE),
14 Film (coat = COA-T-) about Long Island (-LI-) supporter of Israel (Zionist) losing the head (Z) (‘Zionist’ without’= ‘z’ = -IONIST) (COALITIONIST) with politician in government alliance (COALITIONIST),
18 A mix of Italian, French, Greek and Arabic types (LINGUA FRANCA) heard around the eastern Mediterranean, in a manner of speaking (LINGUA FRANCA),
21 There’s more (EXTRA) to former (EX-) beach in Ireland (Irish for ‘beach’ = trá = -TRA) (EXTRA),
22 Curse (curse = IMPRECATE) from mischievous type (IMP-) on record (-REC-) leads to a thick ear (leads to ‘A Thick Ear’ = -ATE) (IMPRECATE),
24 Disparaging remark (slight = S-LIGHT) about a French (a = -UN-) (SUNLIGHT) count’s biggest fear (Count Dracula’s biggest fear = SUNLIGHT),
25 Boasted (bragged) heading off (b) (‘bragged’ without ‘b’ = RAGGED) in tatters (RAGGED),
26 An issue for the HSE? (SICKNESS) One is better off without it! (SICKNESS),
27 The Don, for example (LEADER), is crack (= anagram indicator) dealer (dealer = LEADER).
Down:
1 Jumper (ROLLNECK) to go around and around (on ROLL-) and win by one of the shortest of margins (wins by a -NECK) (ROLLNECK),
2 Inexperienced (raw = WAR) party (do = -O D-) in state of confusion (fog = G- OF) going all the way back (= reverse all indicator) (GOD OF WAR) to Mars (Mars = Roman GOD OF WAR),
3 It’s said the man upstairs loves one (God loves a TRIER) judge (judge/trier = TRIER),
5 Playing them is a breeze (AEOLIAN HARPS) with Russell (George William Russell = AE-), Oscar (-O-) and Spike (nail) (nail = -LIAN) knocking back (= reverse indicator) a few beers (a few HARPS) (AEOLIAN HARPS),
6 One in charge (ORGANISER) of newspaper (newspaper = ORGAN-) is (-IS-) in hospital (-ER) (ORGANISER),
7 Sets up (= reversal indicator) last shot (last ‘shoT’ = -T) for a couple of fathers (Rev + Da = revda = ADVER-) (ADVERT) in commercial (ADVERT),
8 One doing the numbers (SINGER) for OAP from Singapore (‘OAP’ from ‘Singapore’ = singre = SINGER),
11 Gold-digger’s justification (MINING RIGHTS) for working in The Underground? (MINING) The privileges! (RIGHTS) (MINING RIGHTS),
15 Restriction (limitation) heading off (l) (‘limitation’ without ‘l’ = IMITATION) or that’s the impression (IMITATION),
16 Mushroom (ENLARGE-) cloud ultimately (‘clouD’ ultimately = -D) (ENLARGED) can’t be reduced? (ENLARGED),
17 Where some people go for their dates (CALENDAR) all year round, on paper (CALENDAR),
19 Serves (serves) stew (= anagram indicator) (serves = VERSES) in Limerick (limerick poem / VERSES),
20 The (the) wrong (= anagram indicator) (the = ETH-) cut (nick) is trimmed (k) (‘nick’ without ‘k’ = ‘nic = -NIC) (ETHNIC) in one type of restaurant (ETHNIC restaurant),
23 Put a line through (ERASE) some disclaimer as expected (some ‘disclaimER AS Expected’ = ERASE).