Yesterday Across:

1. Timbres, 5. Ounce, 8. Rough diamonds, 9. Eft, 10. April fool, 12. Flimsy, 13. Doofus, 15. Re-enlarge, 16. Rot, 18. Burnt offering, 20. Godly, 21. Refuter.

Down: 1. Throe, 2. Mountaineered, 3. Rehearsal, 4. Shiers, 5. Ohm, 6. Nonconformist, 7. Ensiles, 11. Loose-leaf, 12. Firebug, 14. Prefer, 17. Tiger, 19. Toy.