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 Ruthlessly competitive (3-3-3)
  2. 8a Vitality (informal) (4)
  3. 9a Small low house (8)
  4. 10a Ta-ra! (informal) (2,4)
  5. 11a Like egg yolk (6)
  6. 13a Bagged (anag) — complete rotter! (3,3)
  7. 15a Hard to bear (6)
  8. 16a Nutty (informal) (8)
  9. 18a Mislay (4)
  10. 19a With the order reversed (4,5)
  11. 1d Small tropical animal that eats snakes, rats and birds' eggs (8)
  12. 2d Leaves holder (3,3)
  13. 3d Sharply painful (6)
  14. 4d Goya (anag) (4)
  15. 6d Extinct terrestrial reptiles (9)
  16. 7d Spaghetti dish (9)
  17. 12d Protestant opposed to Northern Ireland ever joining a united Ireland (8)
  18. 14d North American name for a ground squirrel — a resident of Minnesota (6)
  19. 15d Giggle (6)
  20. 17d Elegance (4)