Across

1. Come upon something thought lost

3. It forms over a cut

6. Trick

9. Trade; barter

11. Long-tailed rodent

12. Mark left after cut heals

13. Topmost

14. Canoe paddle

15. Look intently

17. Carry

20. A layer

21. Scorch

Down

1. Briefly popular

2. Small bite

4. Bovine

5. Hit

7. Mom or dad’s brother

8. Mistake

9. Begin

10. Turn away

15. Patrick’s nickname

16. Barely get by

18. In debt

19. It’s used to hear