1: Without a bit of Retin-A, stops wrinkles (7)
2: Dinner trousers get sodden at drinks. (4)
3: Each retiring bachelor's promise finally cast in stone (7)
4: Dine out and stop being vague (13)
5: Prolong Austins suffering (7)
6: Franklin eager to conceal paternity (7)
8: I, for one, adhere to edict (13)
9: Instrument on top of tree or shrub (5)
14: Leave northbound dude in car (4,3)
15: Aged TV horse swallows a couple of turnips (7)
16: Flower, large one, set up outside (5)
17: Sneezy's problem largely fixed (7)
18: Sees unusual section (7)
19: Spoke disrespectfully about university being obsolete (7)