Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Poisonous plant — edible marine snail (10)
  2. 7a Country completely surrounded by South Africa (7)
  3. 8a Goliath (5)
  4. 10a Chinese currency unit (4)
  5. 11a Hand-held firework (8)
  6. 13a Revolving (6)
  7. 15a Framework of stakes interwoven with branches to form a fence (6)
  8. 17a Second largest Channel Island (8)
  9. 18a Obscene stuff (4)
  10. 21a Recurrent theme (5)
  11. 22a Shakespeare's Moor (7)
  12. 23a Trouble spot (10)
  13. 1d Conchiglie, Tagliatelle etc (5)
  14. 2d Swiss creator of a chain of elegant hotels, d. 1918 (4)
  15. 3d Loud hooting cries (6)
  16. 4d From Lagos? (8)
  17. 5d Pamphlet (7)
  18. 6d Ibsen, Miller or Chekhov? (10)
  19. 9d Early 20th-century American dance to ragtime music — try UK torte (anag) (6,4)
  20. 12d Royal female (8)
  21. 14d Plant of the pea family with clover-like leaves (7)
  22. 16d Recover (6)
  23. 19d Extract money by deceit (5)
  24. 20d From Bangkok? (4)