1: Its a firm, small lettuce (3)
2: Sixpence for big cheese? (1.1.1.)
3: Kind of blue hereafter, at heart; this might tell what's to come? (3,4)
4: Farmland female comes back covered with baked clay (7)
5: Each retiring bachelor's promise finally cast in stone (7)
6: Cupboard built using a royal pattern (7)
7: Privy to accessibility (11)
8: We hear actor Paul is one on the way up (5)
11: Dark mysterious thing (5)
12: Invention to trick four into a stupor (11)
17: Lately, liking to spell? (7)
18: Mistakenly laid mop in sheepskin (7)
19: The control is over that way (7)
20: Dryest arts die painfully (7)
21: Abundant specimen doffing cap (5)
24: Prohibit an attorney's organization (3)
25: Looks like an eyesore, sounds like an eyesore (3)