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 Tactless — to admiral (anag) (9)
  2. 8a Accomplishment (4)
  3. 9a It gets discounted fares for train travellers (8)
  4. 10a Take out a loan (6)
  5. 11a Castrated male (6)
  6. 13a Tropical fruit (6)
  7. 15a Grand — time of the year (6)
  8. 16a Literary gathering (4,4)
  9. 18a Slump (4)
  10. 19a Non-stop (9)
  11. 1d Microbes (8)
  12. 2d Ancient burial mound (6)
  13. 3d Contusion (6)
  14. 4d Record (4)
  15. 6d It triggers a big bang (9)
  16. 7d On the dot (9)
  17. 12d Persistently irritating (8)
  18. 14d Dormant (6)
  19. 15d Leader of a religious community for women (6)
  20. 17d Generous — sort (4)