1: Tidy up and clean floor finally and decisively (4,3,3,3)

8: Belgian port getting rid of an idiot (5)

9: Instrument making snout feel odd (4,5)

11: Bury 'im for the meantime (7)

14: He darts around drunk (7)

15: Outfit wins Tet Offensive (7)

17: Farm branches, in part (5)

19: Miserable raise follows poor grade (5)

20: Profile of study-trip (7)

21: Without regard, seed and water plants (7)

23: Bound her, as subject, to a government official (7)

24: A contractor builds or he rents (9)

25: Notes spent in Germany (5)

27: Beat it and ran, for example, with Girl Scout ingredients (9,4)

1: Ninny unmasked without being hoodwinked (9)

2: A hint for the snooker champ? (3)

3: Height is equal to three-fifths of the first one (3)

4: Agitated Tiny pointlessly damned and blasted (9)

5: Start reorganizing notes (5)

6: Discounting losing one's sense of humour? (8,3)

7: Adore inconstant nymph (5)

10: France imports 3/4 gram perfume (9)

12: Cereal vermin seized by superb 16-down (11)

13: User brought back radio part (wrecked sound) to return to use (9)

16: Castle ran out of ones forebears (9)

18: Owned 500 (about right) broken skis in storage locations (4,5)

21: Dixie, perhaps, greeting Japanese food (5)

22: Material featured in 'Sudden Impact' (5)

25: Backblock not all there (3)

26: Fix the oil platform ... (3)