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)