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 Something that's partly good and partly bad (7,3)
  2. 7a Herb (7)
  3. 8a Stony substance that forms reefs in warm seas (5)
  4. 10a Stupefied (informal) (4)
  5. 11a Pre-prandial drink (8)
  6. 13a Portable computer (6)
  7. 15a Project for viewing — conceal from harm (6)
  8. 17a Balderdash (8)
  9. 18a Wind instrument (4)
  10. 21a Military blockade (5)
  11. 22a Fine porcelain with delicate colourings made in Saxony (7)
  12. 23a Pirates' ensign (5,5)
  13. 1d Of poor quality (5)
  14. 2d Thoroughfare (4)
  15. 3d Group of touring performers (6)
  16. 4d Novelty sporting competition — arc cakes (anag) (4,4)
  17. 5d Instrument for execution by strangulation once used in Spain (7)
  18. 6d Blonde fairy tale protagonist (10)
  19. 9d French fabulist, d. 1695 (2,8)
  20. 12d Canada's second largest city (8)
  21. 14d Medicine which has no physiological effect (7)
  22. 16d Food store (6)
  23. 19d Below (5)
  24. 20d Mass of ice floating in the sea (4)