Eight

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Across
  1. 3. the price of or payment for instruction
  2. 5. plant of a genus of Asian herbs with large pointed leaves and flowers
  3. 6. a study, office or place of retreat where one is free from intrusion
  4. 8. rising and falling in waves : fluctuating
  5. 10. old-fashioned : out of date
  6. 11. of, relating to or characteristic of birds
Down
  1. 1. any of numerous extinct flying reptiles having no feathers, a wing membrane, and a tail
  2. 2. an instance of two or more things striking forcefully together typically by accident
  3. 4. left wet and limp by or as if by rain
  4. 7. a piece of writing that provides a thorough and careful argument
  5. 9. a silvery, heavy radioactive metallic element that is used primarily in atomic energy