Dad's 70th Crossword

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Across
  1. 3. It's plain sailing on this salty outrigger, I hear
  2. 6. Jumble Sale
  3. 7. No new threads for this British Soldier
  4. 9. Black billiard ball - no need to count the little ones then!
  5. 10. No harm at all done in the long run
  6. 13. Mower stower
  7. 14. Are you asleep yet?
  8. 16. Clue for Bank Statement
  9. 17. Clue for Ordnance Survey
  10. 20. A camp cleaner and a priest, reportedly!
  11. 21. Eponymous technique
Down
  1. 1. On this drunken date, pubs will be the place to be
  2. 2. Three score peak
  3. 4. Field for a fault-finder
  4. 5. Rocket launch concern
  5. 8. Avoid or Visit? Both, surely!
  6. 11. No! No! They cried. Turned out they were going the wrong way.
  7. 12. Giant Crustacean got him in a hot spot of bother
  8. 15. They have thick skins
  9. 18. Communion offering
  10. 19. Swiss mix
  11. 20. Clue for Hiking