:) 5

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Across
  1. 2. EBGDAE (6)
  2. 6. Clay / Software (5)
  3. 9. Strong tree (3)
  4. 10. Killer of "kachunk" ink stamps and member cards (5)
  5. 11. Analyse This (5)
  6. 12. Communion, but without Religious Education. (8,3)
  7. 15. A happiness tinged with sadness (11)
  8. 16. Expression of mutual understanding (4 - but can be shortened or extended)
  9. 18. Make it suspended (6)
  10. 19. Half of a duo. The other would like to be a famous Gordon (9)
Down
  1. 1. The middle of "Richard Of York". (6)
  2. 3. Edge of (8)
  3. 4. A beginner worries about tools. Experts worry about light. (11)
  4. 5. Surname. He links Potter to Schindler (8)
  5. 7. Expressive, with words (6)
  6. 8. No cows required (3)
  7. 13. An opening used in conjunction with speed.(8)
  8. 14. Cups are better than the brew. (9)
  9. 17. Service of the cloth or of government (8)
  10. 20. Local Singapore expression of negative surprise. (6)