Complete
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1 8 10 12 19 21 2 18 3 13 15 4 9 16 5 14 6 17 20 7 11
  1. 1a Christian organisation with brass bands (9,4)
  2. 8a Poet exiled from Rome in AD8 by Emperor Augustus (4)
  3. 9a Memorial (8)
  4. 10a Apocalyptic battle (10)
  5. 12a Treacherous people (with ladders?) (6)
  6. 14a Trig ratio (6)
  7. 15a Composer of Oliver! (6,4)
  8. 19a Mythical reptile with a lethal look (8)
  9. 20a Miniature whirlpool (4)
  10. 21a Dishonest behaviour (7-6)
  11. 2d French region of many dormant volcanoes, capital Clermont-Ferrand (8)
  12. 3d Clear spirit from Poland, Russia and Sweden, made mainly of water and ethanol (5)
  13. 4d Beams (that may be shivered?) (7)
  14. 5d Admitted (to wrongdoing) (5)
  15. 6d Nuts used to make marzipan (7)
  16. 7d Producer of coins (4)
  17. 11d Uninvited visitor (8)
  18. 13d Extremely funny (slang) (7)
  19. 14d Medical examination (5-2)
  20. 16d Rosie (anag) — willow (5)
  21. 17d Short holiday (5)
  22. 18d Three Wise Men (4)