1: Did a boob resemble navel? (7)
2: Song about death for lover of Theseus (7)
3: Stop following a snake to a pitch (7)
4: When you work it out, Alfie, we fish (7)
5: Vicious return to professional serve reveals the inequality. (13)
6: Finest tree house exhibits gist of problem (7)
7: Scheduled tilt with person in single combat (7)
9: Plowmen let Amy spread job statute (10,3)
14: Dieter's cooking changes again (7)
15: Advice on clues to be anagrammed (7)
16: 'Strike!' the French yell (4,3)
17: Announced at first match: 'You are on the net. This is unprofessional.' (7)
18: Make room for group process (7)
19: To hear's possible in this (7)