Yesterday Across:

7. United Nations, 8. Open plan, 9. Peas, 10. Abreast, 12. Orbit, 14. Scowl, 16. Ecology, 19. Isle, 20. Chessman, 22. Social science.

Down: 1. Snip, 2. Stance, 3. Idolise, 4. Taunt, 5. Kipper, 6. Engaging, 11. Backstop, 13. Science, 15. Weevil, 17. Listen, 18. Scalp, 21. Arch.