Previous cryptic solution

Across: 1. Traps 4. Escapes 8. Mohammedanism

10. Evert 11. Nape 12. Midi 16. Ended 17. Institutional

19. Gallows 20. Gable

Down: 1. Time-consuming 2. Ash 3. Summer 4. Eyelet

5. Charts 6. Privation 7. Something else 9. Appraisal

13. Merino 14. Odours 15. Idling 18. Nub