a PUZZZZZZZZLE

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Across
  1. 3. to show to be fair or right
  2. 9. capable of giving good results
  3. 10. having a strong effect
  4. 11. to leave without returning
  5. 12. many or very many
Down
  1. 1. an evil person or character, especially in a story or play
  2. 2. tending to give the wrong idea
  3. 4. showing clever judgement
  4. 5. to change from one form to another
  5. 6. a plot or scheme
  6. 7. to suddenly attack
  7. 8. to debate or doubt the truth