Complete
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8 9 11 14 18 22 24 1 2 19 3 13 12 4 10 17 15 5 21 23 20 6 16 7
  1. 1a Otherworldliness — utility pairs (anag) (12)
  2. 9a Optical device producing an intense monochromatic beam of light (5)
  3. 10a Cowslip or oxlip, for example (7)
  4. 11a Cry (like a wolf?) (4)
  5. 12a Clerical robe (8)
  6. 14a Large Russian wolfhound (6)
  7. 15a A human 'tail' (6)
  8. 18a Appreciative (8)
  9. 20a Beloved (4)
  10. 22a Enthusiastic applause (often standing?) (7)
  11. 23a Member of an empire in Mexico, destroyed by Spanish conquistadors in 1515 (5)
  12. 24a Cross-country riding for pleasure (4,8)
  13. 2d From August 1945? (4-3)
  14. 3d Uncommon (as hen's teeth?) (4)
  15. 4d Gave a gratuity (6)
  16. 5d Flight (8)
  17. 6d Harden (5)
  18. 7d Basic food additive in Marmite — exert tact, say (anag) (5,7)
  19. 8d A characterful broth? (8,4)
  20. 13d Pallet-raising truck (8)
  21. 16d Betray sexually (5,2)
  22. 17d Pear-shaped fruit used in jams and jellies (6)
  23. 19d One more time (5)
  24. 21d Flag (for a sailor?) (4)