Complete
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1 8 11 14 18 20 22 2 19 17 10 3 9 4 16 15 5 21 23 6 12 7 13
  1. 1a Command given to a trained dog (4)
  2. 3a Disagreements (8)
  3. 8a Coniferous tree (4)
  4. 9a Fearless (8)
  5. 11a Change (10)
  6. 14a Narcotic drug (6)
  7. 15a Social circle (6)
  8. 17a Custodians (10)
  9. 20a Sound made by a mobile phone (8)
  10. 21a Spun thread (4)
  11. 22a Retract (8)
  12. 23a Risqué (informal) (4)
  13. 1d Seven-sided figure (8)
  14. 2d A genius! (8)
  15. 4d Congenital (6)
  16. 5d Publication appearing at regular intervals (10)
  17. 6d Certain sort (4)
  18. 7d Froth made from soap and water (4)
  19. 10d Drawn-out (10)
  20. 12d Computer security system designed to prevent attacks by crackers (8)
  21. 13d Bother (8)
  22. 16d Condition where an internal organ pushes through the abdominal wall (6)
  23. 18d Become bigger (4)
  24. 19d Nautical unit of speed (4)