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. 1 a Stout staff used by mountain climbers (10)
  2. 7 a Thorny shrub with red blossoms, native to Japan (8)
  3. 8 a Something used in baking and roasting (4)
  4. 9 a Hoofed grazer (4)
  5. 10 a Area that includes China, Mongolia, Korea, Japan and most of Siberia (3,4)
  6. 12 a Vicissitudes (3,3,5)
  7. 14 a Praise (7)
  8. 16 a Spike — insult (4)
  9. 19 a Injure and leave permanently disfigured (4)
  10. 20 a Bighead (8)
  11. 21 a Living side by side (2-8)
  12. 1 d Grant (5)
  13. 2 d Mastery (7)
  14. 3 d Hammered spike (4)
  15. 4 d Holder of leaves for a brew (3,5)
  16. 5 d Selected one thing rather than another (5)
  17. 6 d In opposition to (6)
  18. 11 d Holder of powdered tobacco (8)
  19. 12 d Transfer data from one computer to another (6)
  20. 13 d Quarrel bitterly (7)
  21. 15 d J's coded lover? (5)
  22. 17 d Explode (5)
  23. 18 d Raised platform (4)

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