Across: 1. tune, 3. cure, 6. path, 9. poll, 11. air, 12. stub, 13. ogre, 14. I do, 15. fret, 17. feet, 20. rats, 21. skim

    Down: 1. tip, 2. net, 4. Uno, 5. ESL, 7. after, 8. habit, 9. proof, 10. large, 15. far, 16. EST, 18. elk, 19. Tim