Previous quick solution

Across: 1. Wraiths 5. Sieve 8. Imperturbable 9. Two

10. Slumbered 12. Harlot 13. Toward 15. Meandered

16. Sea 18. Reinforcement 20. Miner 21. Nonstop Down: 1. Whist 2. Appropriation 3. Threshold 4. Shut up

5. Sob 6. Embarrassment 7. Emended 11. Broad-bean

12. Humdrum 14. Dry run 17. Act up 19. For