Complete
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7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Cricket delivery that barely bounces (5-6)
  2. 7a Popular music that came from New Orleans in the 1900s (4)
  3. 8a Malaria-transmitting insect (8)
  4. 9a Female spirit of Irish folklore, one with a terrible wail (7)
  5. 11a Violent behaviour (5)
  6. 13a Let in (5)
  7. 14a Sandwich made of a long crusty roll split lengthwise (7)
  8. 16a Seventy-six of these led the big parade (8)
  9. 17a Putsch (4)
  10. 18a Slim-fitting female garment (6,5)
  11. 1d Champagne? (4)
  12. 2d Ethnic group in Equatorial Africa (7)
  13. 3d Arduous search (5)
  14. 4d Nervous — killed by hanging (6,2)
  15. 5d Move items on a screen using a mouse (4,3,4)
  16. 6d Unable to continue batting (7,4)
  17. 10d Natation (8)
  18. 12d Tasty enough to want seconds (7)
  19. 15d Prominent member of the Johnson family (5)
  20. 17d Feature that can wag when talking informally! (4)