Eric's Tea Time Teaser

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Across
  1. 2. royal bird on water (7)
  2. 6. not in (3)
  3. 8. build my own philosophy (8,9,6)
  4. 13. have a break (3,3)
  5. 16. tinkle the ivories on this (5)
  6. 17. reverse metacarpus (8)
  7. 18. sure fire winner (3)
Down
  1. 1. Regal college (5,7)
  2. 3. what happens next (12)
  3. 4. upper hand (9)
  4. 5. can tell a lot about a woman eating this (9,4)
  5. 7. 12 inch defect (9)
  6. 9. hitch ride on a large semi-aquatic rodent (4,3,6)
  7. 10. fancy a game? (6,3,6)
  8. 11. fresh gonads on court (5,6,2,5)
  9. 12. female version of you (5)
  10. 14. stand in line for the flowers (3)
  11. 15. puzzling over Japanese numbers (6)