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 Otto, German-born American conductor and composer, d. 1973 (9)
  2. 8a Was aware of (4)
  3. 9a It lasts 366 days (4,4)
  4. 10a Lay eyes on (6)
  5. 11a Strip (6)
  6. 13a Squeeze tightly together (6)
  7. 15a Swindle — sleuth (anag) (6)
  8. 16a Factors on which a decision is made (8)
  9. 18a Flops (4)
  10. 19a Touchy (9)
  11. 1d Ease up (4,4)
  12. 2d Looked glad (6)
  13. 3d Old explosive device used for blasting holes in gates and walls (with which one should avoid hoisting oneself!) (6)
  14. 4d Flout (4)
  15. 6d Embellish (speech or writing) with different material — learn dirt (anag) (9)
  16. 7d Overwhelming victory — natural disaster (9)
  17. 12d Sudden downturn (8)
  18. 14d Unorthodox opinion (6)
  19. 15d Wellbeing (6)
  20. 17d Plural pronoun, now also used as a gender-neutral substitute for 'she' or 'he' (4)