Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Signal letter Q, flown to indicate ship is carrying disease (6,4)
  2. 7a Marsupial that boxes (8)
  3. 8a Ukrainian capital (4)
  4. 9a System of weights for measuring precious metals and gemstones (4)
  5. 10a Entertainment industry (7)
  6. 12a Hot and cold sweet (5,6)
  7. 14a Lethargy (7)
  8. 16a Truncheon (4)
  9. 19a Slovenly layabout (4)
  10. 20a Youngster (8)
  11. 21a Varied collection (10)
  12. 1d Leavening agent (5)
  13. 2d Long and tedious effort involved in gathering basic information (7)
  14. 3d Gumbo (4)
  15. 4d Small area captured and held as the basis for subsequent advance (8)
  16. 5d Crooked (5)
  17. 6d Eye part (6)
  18. 11d Sea between Italy and the Balkans (8)
  19. 12d Mess up (6)
  20. 13d Dried pale yellow seedless grape (7)
  21. 15d Jewish teacher (5)
  22. 17d Athletic and muscular (non-vegetarian?) (5)
  23. 18d Longitudinal structure supporting the frame of a vessel (4)