The Marshlands

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Across
  1. 6. Extraordinary consumable (10,6)
  2. 8. Cuppa' to hire (5)
  3. 9. Joan's TV double (4,6)
  4. 11. Buffet lunch very Sunday here (4,4,3)
  5. 13. Where an aged flock of ruffs might live (3,4,8)
  6. 15. Confusing, so it's said, this Marshland creek (11)
  7. 17. In time off army duty, there are many here (4)
  8. 19. A vital order, its capital too, customs and social behaviour (11)
  9. 20. A place to purchase employment (8)
Down
  1. 1. Vehicles wait here to board (4,4)
  2. 2. In a way a place to meet in secret (6)
  3. 3. Humour that comes naturally, it's said (8)
  4. 4. Windy promontory where impressionable people gather (8)
  5. 5. A featherweight's abode (10)
  6. 7. Ditch this unpleasant person first (10)
  7. 10. Sounds like pause needed after throwing a wobbly! (5,4)
  8. 12. Three points confused and see the solution (6)
  9. 14. One time everywhere but Whitgift (8)
  10. 16. Reduce drastically around gristle carrying less weight (7)
  11. 18. Waterlogged ground (9)