unda

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Across
  1. 4. I found it on the road (5)
  2. 5. punting on the Cam (9)
  3. 8. is it natural or learned? (7)
  4. 10. 'ello, 'ello (2)
  5. 11. a project of value (6,7)
  6. 12. debate (11)
  7. 13. stop complaining and don't become one of these (3)
  8. 14. do this before & after (4,7)
  9. 16. he swore out loud (11)
  10. 18. winter olympics 1988 (7)
  11. 19. add up, total (6)
  12. 20. you love being one (5)
Down
  1. 1. differential diagnosis by another name (10)
  2. 2. an emetic student opus (9)
  3. 3. Narcissus fell in love with his (10)
  4. 6. uncle with an academy award? (4)
  5. 7. I can see clearly now the rain has gone (7,5)
  6. 9. chinwags with a common purpose (3)
  7. 15. he drank hemlock (8)
  8. 17. an assessment that doesn't count (9)