Complete
00:00:00
8 10 13 16 6 5 19 1 17 2 9 14 3 11 15 4 12 18 7
  1. 5a Thickening agent in cooking (9)
  2. 8a Sterile (4)
  3. 9a Delinquent (8)
  4. 10a Playful (6)
  5. 11a Gloomy (6)
  6. 13a Twitchy (2,4)
  7. 15a Purge (6)
  8. 16a Lethargy — not in CIA (anag) (8)
  9. 18a People (4)
  10. 19a Haphazard (3,2,4)
  11. 1d Flute or oboe, for instance (8)
  12. 2d Seize — fragment (6)
  13. 3d Habitually (6)
  14. 4d Scottish island — mountains on the French-Swiss border (4)
  15. 6d Conspicuous (9)
  16. 7d Give up (9)
  17. 12d Henry VIII's warship that sank in the Solent (8)
  18. 14d Inventor with over 1,000 US patents to his name, d. 1931 (6)
  19. 15d Canal or hat? (6)
  20. 17d Copy without acknowledgement (4)