Across

1. A shellfish

3. Mark left after cut heals

6. Pull along on the ground

9. A seasoning

11. Decay

12. Fencing sword

13. Ammunition

14. Electrocardiogram

15. Changed the color

17. Gas station

20. Weight watchers or Atkins

21. Do this to a fly

Down

1. A fish

2. Chemical in Aspirin

4. Central Intelligence Agency

5. Long-tailed rodent

7. Answer back

8. Want too much

9. Performance platform

10. Table or floor lights

15. Thing that fails to work

16. Barely get by

18. Stitch with needle and thread

19. Not in