Across

• 7. Beast from wild Manila (6)
• 8. Light gas holds your last half nerve cell. (6)
• 9. Lady returns Adam's second rib. (4)
• 10. Doctors skip clam for mushrooms (8)
• 11. Spain invested in castles for woodlands (7)
• 12. Bike period? (5)
• 14. Saunter around blame (5)
• 16. Troglodyte gets name back after 100 and a five (7)
• 19. Snake squirms on Canada (8)
• 20. Broken gear produces fury. (4)
• 21. Rawest flowing rivers or oceans? (6)
• 22. Unrate grotesque character (6)

Down

• 1. Ecological vandalism of an elm inventor (13)
• 2. Doctor sued GM producing smear (6)
• 3. 151 copulate for atmosphere. (7)
• 4. Grassy hill hosts yak. No llamas! (5)
• 5. Brawny, clumsy, in a mess. (6)
• 6. Twins lopped off guy's head with tempers. (13)
• 13. Saudi Arabia against a new sodium grassland (7)
• 15. Plant-like surface growth to draw comparison, reportedly? (6)
• 17. Greets free birds. (6)
• 18. Hangs around to grind teeth. (5)