Weekly Crossword 19/03/26

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Across
  1. 1. Required for an answer? (8)
  2. 5. Experiment (7)
  3. 7. Sphere (4)
  4. 9. Patience? (9)
  5. 11. Standards? (12)
  6. 12. Response measure - Something like a token? (7)
  7. 13. Release (7)
  8. 15. Neptune counterpart (8)
  9. 18. Evolution (10)
  10. 19. Undefined (5)
Down
  1. 2. To the victor (6)
  2. 3. French bread (8)
  3. 4. Aesop hoist (anag.) (10)
  4. 6. Entertaining (6)
  5. 8. Hungry season? (6)
  6. 10. Reach a boiling point? (8)
  7. 14. Alarm delay option (6)
  8. 16. Unengaged (9)
  9. 17. Organization (or celebration) (5)
  10. 18. Rhetorical repetition (8)