1: Win, or find an heir (9)
3: Put another way, perhaps, clarinet overwhelming harps, somehow (9)
4: Consider sound possibility (5)
5: Just grazed the pasty? (4-7)
6: Reject the upset outcast (5)
8: Become less formal, and recommend accepting trio of Hawkeyes (4,3)
11: Girl hatches subterfuge in prison tower (11)
14: Ran, taking a shot, and told the story (7)
15: In morning, use me and part of the Bible for diversion (9)
16: General's horse galloping to dangerous coasts (3,6)
18: A group performing with energy 'The Untouchables' e.g. (5)
20: Will, in the past, cried out 'timber' (5)