1 Overthrow of McMcTavish, caused by meteorites? (7)
2 Penetrating the beginning of Ximenes? I'm baffled - it drives one mad (10)
3 Winter sportsman round peak of Vosges does splits (6)
4 Gin's tempting: your tin'll go before time's up (5)
5 Half a comma, i.e. a boy's best friend (7)
6 Dawgs didn't orter ̶̶ sheep, but zumbody 'as (5)
7 Tortuous clue and prizeworthy? Only the beginning of it: getting an H.C., perhaps (8)
8 The sound of footsteps in a bog is hardly a boom (5)
9 Black and White (Scotch) - about four tumblers here: then bring up three (5)
13 Small land-owner has a special sort of pocket with lots of papers to be filled in (10)
15 Old crook lets race become phony (8)
19 Mixture, both ingredients soft - a drink to waste (7)
20 The very last animal for 'Arry to support (7)
23 I'm at sea - a very stiff paper (6)
24 Sue one of the courtiers of Darius? (5)
25 I'm British - halt, says he to enemy scum (5)
26 King here had capacious bed: hence the prohibition about sexiness? (5)
27 Transports, or twansports for those in twouble? (5)