Complete
00:00:00
7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Malicious criticism (7,3)
  2. 7a Weapon favoured by Prohibition-era gangsters (5,3)
  3. 8a Grim (4)
  4. 9a Digestive fluid (4)
  5. 10a Idiotic (7)
  6. 12a Hyper-keen worker (5,6)
  7. 14a Define clearly (7)
  8. 16a Nibble at (4)
  9. 19a UK concert – US dance (4)
  10. 20a Copycat (8)
  11. 21a 3-D puzzle (6,4)
  12. 1d Advanced atomic weapon (1-4)
  13. 2d Interval between connected events (4,3)
  14. 3d Brobdingnagian (4)
  15. 4d W in the periodic table (8)
  16. 5d From the distant past (5)
  17. 6d Artilleryman (6)
  18. 11d Spray-painted writing (8)
  19. 12d Become invalid (6)
  20. 13d Pacific island country (7)
  21. 15d Wales in Welsh (5)
  22. 17d Entire (5)
  23. 18d Sibilant sound (4)