Saturday Across:

1 & 23ac. The ten of clubs, 4. Mosaic, 9. Know-all, 10. Three, 11. Ideal, 12. Durable, 13. South Africa, 18. Element, 20. Decay, 22. Tutor, 24. Expire, 25. Slalom.

Down: 1. Take-in, 2. Erode, 3. Epaulet, 5. Otter, 6. Aerobic, 7. Crewel, 8. Slide action, 14. One-step, 15. Radical, 16. Settee, 17. Gypsum, 19. Error, 21. Churl.