Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Proposition — set us going (anag) (10)
  2. 7a He wants to wreck things (8)
  3. 8a Split in two (4)
  4. 9a This size is rather small (4)
  5. 10a Walk unhurriedly (7)
  6. 12a Endorsement (11)
  7. 14a Prevent from being ruined (7)
  8. 16a Heavy (4)
  9. 19a Problems (4)
  10. 20a Never wrong (8)
  11. 21a In stages (4,2,4)
  12. 1d Overwhelm (5)
  13. 2d Adult (5-2)
  14. 3d Couple of lookers (4)
  15. 4d Move in a different direction (4,4)
  16. 5d Ancient (5)
  17. 6d Absorb (4,2)
  18. 11d Bound to succeed at this field event? (4,4)
  19. 12d Productive farmland (6)
  20. 13d Receive genetically (7)
  21. 15d Call in (5)
  22. 17d Do one's homework (informal) (3,2)
  23. 18d Really (4)