1. Make mention (6)
4. Guardian (8)
10. Treatise (9)
11. Virile (5)
12. Famous (5)
13. Naive (9)
14. Melodious (7)
16. Biblical garden (4)
19. Holds up (4)
21. Maintain (7)
24. An abrasive material (9)
25. Pore (5)
26. A South American bird (5)
27. Assessment (9)
28. Permanency (8)
29. Semiformal evening dress for men (6)
Down
1. Chew over (8)
2. Constancy (8)
3. Stiff (5)
5. Jock (7)
6. "Thinking machines" (9)
7. Physician (6)
8. Grumble (6)
9. Call off (6)
15. Step (9)
17. Louvered window (8)
18. Gravure (8)
20. Highest female voice (7)
21. Banding (6)
22. It's surrounded by water (6)
23. Marked by injustice (6)
25. Disorganized (5)