Complete
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6 8 10 13 16 19 21 7 1 18 17 2 9 15 14 3 12 20 11 4 5
  1. 1a Backed by all (9)
  2. 8a Endorsement printed on a book cover (5)
  3. 9a Fortress — Aldi etc (anag) (7)
  4. 10a Competitors (8)
  5. 11a ___ Shankar, Indian sitarist and composer, d. 2012 (4)
  6. 13a John in America (6)
  7. 14a Bungled tennis shot? (6)
  8. 16a Per person (4)
  9. 17a Safety barrier (4,4)
  10. 19a Ventures — quips (7)
  11. 20a Odds that could double your money (5)
  12. 21a Prefabricated building with a corrugated iron roof, first produced in WWI (6,3)
  13. 1d Not surpassed (8)
  14. 2d American author, Louisa May ___ , d. 1888 (6)
  15. 3d Keen on (4)
  16. 4d Out of the ark! — Noah's odd life (anag) (3-9)
  17. 5d Egocentrism (4-8)
  18. 6d Action that serves as a warning to others (6,6)
  19. 7d Carl's lunatic (anag) — acclaim for actors at the end of a play (7,5)
  20. 12d It should keep one afloat (4,4)
  21. 15d Colourless brandy made from morello cherries (6)
  22. 18d Fair — punishment (4)