1: Land under sailor, for heaven's sake! (9)
2: Private dinner starts late (5)
3: Something good made by dwarf barber, perhaps! (6,7)
4: Misleading credit card rejected in the day before (7)
5: Original marks in bad degree came to light (7)
6: Expert standing in an area at the front of the stage (5)
7: Steno erratically scribbles (5)
10: Those who study bugs' motion got less confused (13)
12: Fix the oil platform ... (3)
13: Uninitiated stoop to finish (3)
14: Change in ultimate diet for the evening? (9)
17: Outstanding saltine crackers? (7)
18: Kidnaps sailors swimming around the Channel (7)
19: Vapour in the street the final morning (5)
20: Mature writer beyond racy, impertinent introductions (5)
21: Hangs ten vassals at hearing (5)