3. 1968 show (4)
10. exhale audibly a long deep breath with a lisp (5)
11. listeners to jonathan ross may think this is a card game (5)
13. rubbish (5)
15. dovetail or mortice & tenon (6)
17. not really the lowest part (6)
19. sometimes vented (6)
20. two pies into circumference (6)