Complete
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7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Heavy tracked earth-moving vehicle (11)
  2. 7a Nomadic inhabitant of northern Scandinavia (4)
  3. 8a A sincere (anag) — raise (8)
  4. 9a Quickly (2,5)
  5. 11a Cunning (5)
  6. 13a Large ladle (5)
  7. 14a Tropical grassland (7)
  8. 16a Find and bring back (8)
  9. 17a Bend (4)
  10. 18a Disturb the status quo (4,3,4)
  11. 1d Gradation (4)
  12. 2d Umpire (7)
  13. 3d Pilfer (5)
  14. 4d Shout of praise to God (8)
  15. 5d Name for a rooster in fairy tales — nicer chalet (anag) (11)
  16. 6d Gloriously beautiful (11)
  17. 10d Lengthen in time (8)
  18. 12d Stratified (7)
  19. 15d Hated (anag) — expiry (5)
  20. 17d Dessert of puréed fruit and cream (4)