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 Boisterous comedy involving collisions and practical jokes (9)
  2. 8a Clarified butter used in Indian cookery (4)
  3. 9a Unrealistic (8)
  4. 10a Ask (6)
  5. 11a With great force (6)
  6. 13a Hard mineral consisting of silicon dioxide in crystal form (6)
  7. 15a Canny (6)
  8. 16a Give heart to (8)
  9. 18a Obnoxious lot (slang) (4)
  10. 19a Burrowing mammal covered with strong horny plates (9)
  11. 1d Underlying (8)
  12. 2d Cloudy — obscure (6)
  13. 3d Chamber (6)
  14. 4d Reverberation (4)
  15. 6d Whatsit — my thin mug (anag) (9)
  16. 7d Small northern grey gull with a shrill cry sounding like its name (9)
  17. 12d Grotesque waterspout (8)
  18. 14d Narrow belt in the heavens divided into 12 signs for astrological purposes (6)
  19. 15d Illuminated by a star during the day (6)
  20. 17d Bhindi (4)