2: Auto manufacturer meeting a lieutenant in 'The Ancient Mariner'? (3,4)
3: It's over, over, over, kept apart by past payment (7)
4: Turning back, Sid went in to astonish naturalists (7)
5: Ships use up aid at sea; remain in a grave situation (4,2,7)
6: Dressing of malt and beans to make horse tender (9)
8: Modernise rear, in the opinion of escort (5,2,2,4)
10: Approaches first of nine pieces of corn (5)
13: A large bird or a large mammal that flies by Monica's sister (9)
16: Put a new value on what secret agent is hiding (5)
17: For motivation we are led by a Demon and Frog. (7)
18: Ryes, gin, rum in shooter? (7)
19: Responds to a state with a royal bearing (7)
22: I had been at the front, and retired (5)