Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a The Hunchback of Notre-Dame author (6,4)
  2. 7a Actually present (2,6)
  3. 8a Julius Caesar's unlucky day in March (4)
  4. 9a Glandular secretion from a male deer, used in making perfume (4)
  5. 10a Go away (like a swarm?) (4,3)
  6. 12a Hot spot in the Mojave Desert, some of it 282ft below sea level (5,6)
  7. 14a Obstreperous (7)
  8. 16a Shivering fit (4)
  9. 19a Where coins were made (4)
  10. 20a Member of a former confederacy of six Native American peoples (8)
  11. 21a In the first place (10)
  12. 1d Malice (5)
  13. 2d London football club (7)
  14. 3d Approximately (2,2)
  15. 4d Central American country, capital Tegucigalpa (8)
  16. 5d Garishness (5)
  17. 6d Interior of a steeple (where bats hang out?) (6)
  18. 11d Gigantic (8)
  19. 12d Particular (6)
  20. 13d Attempt, as a joke, to make somebody believe something that is not true (3-4)
  21. 15d Freshwater mammal with webbed and clawed feet (5)
  22. 17d Enlighten (5)
  23. 18d Soft feathers (like this clue) (4)