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 Cutting — snide (9)
  2. 8a River estuary between Argentina and Uruguay (5)
  3. 9a Overall chief (7)
  4. 10a Inca raid (anag) — it's a combination of industrial gas emissions with water in the atmosphere (4,4)
  5. 11a Touch with the lips (4)
  6. 13a Sea journey (6)
  7. 14a Jinx (6)
  8. 16a Stolen goods (4)
  9. 17a One from the island where Napoleon Bonaparte was born (8)
  10. 19a Marked with blotches (7)
  11. 20a Aquatic mammal that lives in a holt (5)
  12. 21a Requiring great exertion (9)
  13. 1d Historically, the cheapest accommodation on a 13 (8)
  14. 2d Countrified (6)
  15. 3d Mountains of south-central Europe (4)
  16. 4d Chicago (3,5,4)
  17. 5d Type of running race (5,7)
  18. 6d Convey a great deal without using words (5,7)
  19. 7d GP (6,6)
  20. 12d North African dish of steamed semolina with a stew (8)
  21. 15d Family car manufactured by Ford since 1993 (6)
  22. 18d 'A man, a ___ , a canal: Panama!' (4)