Across:
1 Types of circuitous paths (ORBITS) to cook's (= anagram indicator) bistro (bistro = ORBITS),
4 Thrown off balance (DISMAYED) as local kicked the bucket (died = DI-ED) containing dug up (= reversal indicator) tubers (yams = -SMAY-) (DISMAYED),
9 It goes (it goes) badly (= anagram indicator) (it goes = EGOIST) for promoter of the selfie perhaps? (EGOIST),
10 Check out devices (checkout devices = SCANNERS scan barcodes) the medical practitioners use? (SCANNERS),
12 Wrote a tasting note (DESCRIBED) for bubby (= anagram indicator) ciders (ciders = DESCRI-) perfect for lying down (-BED) (DESCRIBED),
13 Trademark (BADGE) bill (-AD-) before (= position indicator) Government (-G-) in Belgium (B-E) (BADGE),
14 One of those at The Abbey (BROTHER-) is popular (-IN-) with the foreign (‘the’ foreign = LA-) women (-W) (BROTHER-IN-LAW) related by marriage (BROTHER-IN-LAW),
18 It can be stressful (NERVE-RACKING) to tour (= anagram indicator) never (never = NERVE-) using GPS (tracking) without a leader (t) (‘tracking’ without ‘t’ = - RACKING) (NERVE-RACKING),
21 Meatballs without best (‘meatballs’ without ‘best’ = maall = LLAMA) type of meat from The Andes? (LLAMA is a meat from the Andes),
22 The trouble-shooting columnist (AGONY AUNT) from abroad (= anagram indicator)? Not Guyana! (not Guyana = AGONY AUNT),
24 Greek letter (CHI-) is not the first (‘Not’ the first = -N-) Greek letter (CHI-) to new (-N) (CHIN-CHIN) and to absent friends (to absent friends = a toast = CHIN-CHIN),
25 Type of paste (TAHINI) produced by carers from Christian Era (‘carers’ from ‘Christian Era’ = hitian = TAHINI),
26 Supplying morally uplifting directions (EDIFYING) to engineer (E-) on last legs (dying = -D-YING) going around island (-I-) and starting to flag? (starting to ‘Flag’ = -F-) (EDIFYING)
27 Miner is out of instruments (‘miner’ is out of ‘instruments’ = stunts = STUNTS) for daredevil displays (STUNTS).
Down:
1 What a borrower might do (OWE A DEBT) for good books (Old Testament = O- -T) about mostly (r) Don ('wear' without 'r' = -WE A) King (bed) retiring (= reverse indicator) (bed = DEB-) (OWE A DEBT),
2 They’re bound to sell (BOOKS-) on a short trip (-HOP) (BOOKSHOP) to a novel place? (BOOKSHOP),
3 A piece that’s shocking (TASER) and upsetting (= reverse indicator) inside – now there’s a thing (inside ‘now theRES A Thing’ = resat = TASER),
5 Episode (INCIDENT) from The Office (ROOM) (INCIDENT ROOM) – the one where the police are wondering whodunnit (INCIDENT ROOM),
6 The last Don (last letter of ‘doN’ = -N-) at the centre of gangsterism (at the centre of ‘gangsTerism’ = -T-) in The Mafia (mob = MO- B-)? Clan (clan) boss (= anagram indicator) (clan = -LANC) (MONT BLANC) in The Alps! (MONT BLANC),
7 Throws in the towel (YIELDS) and tediously misses out (‘tediously’ misses ‘out’ = edisly = YIELDS),
8 Friend of dancer (reindeer DASHER friend of reindeer Dancer) is a fast mover (DASHER),
11 GPO, for example? (ABBREVIATION) No (no = ‘number’), in the numerical sense! (ABBREVIATION),
15 Brief (t) success (hit) (‘hit’ without ‘t’ = HI-) at archery (archery) confusing (= anagram indicator) (archery = -ERARCHY) (HIERARCHY) top people in organisation (HIERARCHY),
16 Guillotined, missing leg (‘guillotined’ missing ‘leg’ = uilotind = DILUTION) and weakening (DILUTION),
17 Sounds like Freud’s holiday plans (EGO TRIPS) with presumably self-catering options (EGO TRIPS),
19 Sounds like (= homophone indicator) lake (‘lough’ = ‘loch’ = -LOCH-) in Clare (C-E) (CLOCHE) offers protection to those growing vegetables in winter (CLOCHE),
20 Pussy foot (paw = WAP-) around (= reversal indicator) centre with (centre ‘wITh’ = -IT-) one (-I) (WAPITI) buck (WAPITI deer /stag)
23 Alley cats call out (‘Alley cats’ call out/ without ‘call’ = aeyts = YEAST) one of those responsible for The Rising (YEAST).