Complete
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1 8 10 13 17 21 24 2 18 3 12 11 4 16 22 14 5 9 20 19 6 15 7 23
  1. 1a Rod with rake for relieving irritation (13)
  2. 8a Three similar things considered as a unit (7)
  3. 9a Low evergreen heath plant (5)
  4. 10a You can't relax with these in your pants (4)
  5. 11a One with a constantly negative attitude (8)
  6. 13a Arrive (4,2)
  7. 14a Hard worker — malicious software (6)
  8. 17a Responding to a stimulus (8)
  9. 19a Take to one's heels (informal) (4)
  10. 21a In danger of falling off (5)
  11. 22a Major Roman Catholic pilgrimage destination in southern France (7)
  12. 24a Referee (one hoping to ensure the game is up?) (7-6)
  13. 1d Nocturnal flying animal (3)
  14. 2d American beast (7)
  15. 3d Period for buying at reduced prices (4)
  16. 4d Knocking sound (3-3)
  17. 5d Best roué (anag) — of course (2,2,4)
  18. 6d Total rubbish (informal) (5)
  19. 7d Dutch painter, d. 1669 (9)
  20. 10d Pleasure felt following the event (9)
  21. 12d Result of dividing one number by another (8)
  22. 15d Curious member of the crow family (7)
  23. 16d Slim and elegant (6)
  24. 18d Garlic mayo (5)
  25. 20d Optimistic stock market investor? (4)
  26. 23d Formal address for a man (3)