Cryptic Crossword #1

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Across
  1. 5. Instrument listed in sepia notebook
  2. 6. Bottle closed to poultry
  3. 10. Inter-School Officer captures muse, perhaps
  4. 12. Kindness is two-thirds Nicene
  5. 14. Paris pool, London fish
  6. 15. Director General takes a leery look at sharp turn
  7. 17. Bar drink sounds sick
  8. 18. Time takes nature for madness spike
Down
  1. 1. Tiger Wood's tee-off... or a piece of computer hardware?
  2. 2. German city swallows a very small piece of fleischwurst
  3. 3. Chinese military governor, uncut with Heraldry, has gone crazy!
  4. 4. First quarter economic debut: Australian short note is female author.
  5. 7. City in Czechoslovakia
  6. 8. Enter poker pot by worker with Entitlement
  7. 9. A hearty thing is a Bordeaux feast ending with chai
  8. 11. Shakespearean protagonist features foremostly in iambic gold
  9. 13. Instrument is heard by fabricator
  10. 16. Sheep jumps fence, weeps