Complete
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8 10 13 16 6 5 19 1 17 2 9 14 3 11 15 4 12 18 7
  1. 5a Three-stringed instrument used to play Russian folk music (9)
  2. 8a Forearm bone (4)
  3. 9a Federal prison in California, 1934-63 (8)
  4. 10a Prone to chuckling (6)
  5. 11a One or the other (6)
  6. 13a Not a good person! (3,3)
  7. 15a Glitch (6)
  8. 16a Night light? (8)
  9. 18a Master (4)
  10. 19a Seemingly without limit (9)
  11. 1d Tirade (8)
  12. 2d Bright yellow shade (6)
  13. 3d Lacking social polish (6)
  14. 4d Parody (4)
  15. 6d Croc's close relative (9)
  16. 7d Preserve (9)
  17. 12d (Of a problem) difficult to handle and requiring great tact (8)
  18. 14d The Quiet American author (6)
  19. 15d Lecture on a moral topic (6)
  20. 17d Gas used in fluorescent lighting (4)