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 Resonance (13)
  2. 8a Long and hollow (7)
  3. 9a Punctuation mark (5)
  4. 10a Wharf (4)
  5. 11a Joyous emotion (8)
  6. 13a Causing wry amusement (6)
  7. 14a US space programme, 1961-72 (6)
  8. 17a Circular piece of hair pressed against forehead (4,4)
  9. 19a Discharge (4)
  10. 21a Oklahoma city — salut (anag) (5)
  11. 22a Fabric with raised pattern — co-ed bar (anag) (7)
  12. 24a Prank (9,4)
  13. 1d Putrefaction (3)
  14. 2d Pulsating musical effect (7)
  15. 3d Have confidence (in) (4)
  16. 4d Bawdy (6)
  17. 5d Sweet spirit-based drinks marketed for the young (8)
  18. 6d Dwelling in the far north (5)
  19. 7d Kid's mother? (5,4)
  20. 10d Lively ballroom dance (9)
  21. 12d Graph with circle divided into proportional sectors (3,5)
  22. 15d Lower back pain (7)
  23. 16d Middle East and North African language (6)
  24. 18d Saucy dance? (5)
  25. 20d Vote (4)
  26. 23d Sheep (3)