Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Stop working (4,2)
  2. 4a Knobbly bits (5)
  3. 7a Critical moment? (6)
  4. 8a One can be vicious or virtuous (6)
  5. 9a Widespread (4)
  6. 10a Turning point (8)
  7. 12a Disabled (3,2,6)
  8. 17a Violent attacks (8)
  9. 19a Turned quickly around (4)
  10. 20a Lack of what's needed (6)
  11. 21a Lack of emotion (6)
  12. 22a All together (5)
  13. 23a Stage business (6)
  14. 1d Undercover way in? (7)
  15. 2d Background (7)
  16. 3d Not co-operative (9)
  17. 4d Owner of extensive parts of Scotland? (5)
  18. 5d Model construction set first patented by Frank Hornby from Liverpool in 1901 (7)
  19. 6d Underhand (6)
  20. 11d Essential — as scenery (anag) (9)
  21. 13d A nobody (who thinks he's somebody) (7)
  22. 14d Set up (7)
  23. 15d Badly behaved (7)
  24. 16d Member of an armed gang (6)
  25. 18d Up to a given moment (5)