Complete
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7 9 11 14 18 21 1 24 2 12 3 19 22 4 13 17 15 5 16 20 6 10 23 8
  1. 1a Railway track less wide than the standard 56.5 inches (6,5)
  2. 9a Altruistic (9)
  3. 10a Chopper (3)
  4. 11a Dig (5)
  5. 13a Start of play in ice hockey (4-3)
  6. 14a Window dressing — a decaf (anag) (6)
  7. 15a Small measure of alcohol (6)
  8. 18a Surgical instrument — true etc (anag) (7)
  9. 20a Key principle or assumption (5)
  10. 21a Barley bristle (3)
  11. 22a Man-made lake (9)
  12. 24a It indicates where to get a haircut (7,4)
  13. 2d Donkey (3)
  14. 3d Broadcast (7)
  15. 4d Smelly (informal) (6)
  16. 5d For one specific purpose (2,3)
  17. 6d One of the 13 historic counties of Wales, split into three in 1972 (9)
  18. 7d Not deep (11)
  19. 8d Not deep (11)
  20. 12d Tropical tree with blue trumpet-shaped flowers (9)
  21. 16d Rock formation that appears above the surface of the surrounding land (7)
  22. 17d More impenetrable (6)
  23. 19d Beat rhythmically (5)
  24. 23d Night bird (3)