No proper nouns!

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Across
  1. 4. Key to something
  2. 5. “I know it when I see it”
  3. 6. reduce
  4. 9. Response to clever word play
  5. 16. Texan greeting
  6. 17. The first inkling of a clue
  7. 18. Green Ice cream
  8. 20. Government takeover
Down
  1. 1. Leafy green
  2. 2. “It’s always greener…”
  3. 3. Power of the countries of the United Nations Security Council
  4. 7. To tolerate something in a holy way
  5. 8. A high arching sports play
  6. 10. A drunken prophet
  7. 11. “You’re welcome!”
  8. 12. Not successful
  9. 13. unoriginal math
  10. 14. “Too Clever…”
  11. 15. Fancy vocabulary
  12. 19. Word can be pink or of the tounge
  13. 21. Goes with “The ball” or “word”