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