Across:
1 Some Kosovan taskforce (some ‘Kosovan taskforce’ = vantas) review (= reversal indicator) (vantas = SAT NAV) offers a route map out of a jam (SAT NAV),
4 He’d (-HED-) fallen into playing (= anagram indicator) cards (cards = C-DARS) (CHEDDARS) with cheesy types (CHEDDARS),
9 Sample covered up in a tureen (sample covered up ‘in a tureen’ = NATURE) of kidney (NATURE),
10 Authorisation (SANCTION) for a (-A-) certificate of roadworthiness (-NCT-) in Jerusalem (S-ION) (SANCTION),
12 One of those in the Marantaceae family (ARROWROOT) in Dart (ARROW-) and part of The Underground system (-ROOT) (ARROWROOT),
13 Piece of land (TRACT) for the players (-ACT) behind (= position indicator) two-sevenths of tryline (two sevenths of ‘tryline’ = -TR-) (TRACT),
14 Flipping decision (HEADS OR TAILS) for those starting 5 down (‘head teachers’= HEAD-) is to find a solution (sort = -S OR T-) to Troubles (-AILS) (HEADS OR TAILS),
18 Open the drinks (DO THE HONOURS) party (DO) for most of them (most of ‘them’ = THE) mentioned in Dispatches (HONOURS) (DO THE HONOURS),
21 Stonewall without news (‘stonewall’ without ‘news’ = toall = ALLOT) to distribute (ALLOT),
22 Get lucky (STRIKE OIL) with hit (STRIKE) from Grease (OIL) (STRIKE OIL),
24 Nearly all the port (nearly all the ‘port’ = -POR-) absorbed by a pink hue (coral = COR-AL) (CORPORAL) can be rank (CORPORAL),
25 Tragedies are missing (‘tragedies’ are missing/without ‘are’ = tgdies = DIGEST) for publication (DIGEST),
26 The spit (SPLUTTER) of wild (= anagram indicator) turtles (turtles = S-LUTTER) found around park (-P-) (SPLUTTER),
27 A Dane’s (a dane’s = SEANAD) representation (= anagram indicator) of the house in Ireland (SEANAD).
Down:
1 Come clean (-BATHE) after star (SUN-) (SUNBATHE) gets bronze (SUNBATHE),
2 Classy type (TUTORIAL) of Trade Union (TU-) from Rialto (Rialto = -TORIAL) movement (= anagram indicator) (TUTORIAL),
3 It’s a sign (ARROW) of what’s raw or (raw or = ARROW) off (= anagram indicator),
5 Office holders setting terms (HEAD TEACHERS) for one going on the beer (HEAD on beer) with those involved in the class struggle perhaps (TEACHERS) (HEAD TEACHERS),
6 Criminal (= anagram indicator) latched on (latched on = DECATHLON) to event for sporty types (DECATHLON),
7 Line managers dishing out greens (‘line managers’ dishing out ‘greens’ = limana = ANIMAL) with chicken (ANIMAL),
8 Pick out (SE-E) shady type (tan = -NAT-) turning up (= reversal indicator) inside (SENATE) similar to 27 across (‘Seanad’ = SENATE),
11 Press (FOURTH ESTATE) onward (“forth” = “FOURTH”), in a manner of speaking (= homophone indicator), towards Spain (E-) and Portugal, for example (-STATE) (FOURTH ESTATE),
15 Iron (SMOOTH OUT) for clean-shaven type (SMOOTH) on holiday (OUT) (SMOOTH OUT),
16 Money (EURO-) for heartless (c) nut (‘pecan’ without ‘c’ = PEAN) (EUROPEAN) one associates with perm, for one? (one associates with Perm/ Russia, for one? = EUROPEAN),
17 Does tail (does tail = ISOLATED) wag (= anagram indicator) in quarantine? (ISOLATED),
19 Quick looks (glances) heading off (g) (‘glances’ without ‘g’ = LANCES) for spikes (LANCES),
20 Type of arrangement (FLORAL arrangement) is all for (all for = FLORAL) mischief (= anagram indicator),
23 Cocktail (‘cock’ tail = K-) is fine (fine = -NIFE) (KNIFE) – possibly (= anagram indicator) it will take the edge off (KNIFE).