1. Inability to understand language (7)
5. Clap (7)
9. Recall the past (9)
10. Stubble (5)
11. Dirtiness (7)
12. A deliberate act of omission (7)
13. Followed by thunder (9)
15. Undue speed (5)
17. Country (5)
19. Dry up (9)
22. A control surface of a plane (7)
25. Taxonomic group (7)
26. Picture (5)
27. Not genuine (9)
28. Affluent (7)
29. In that (7)
Down
1. Spray can (7)
2. Ground beef (9)
3. Undershirt (7)
4. Aggressively self-assured (9)
5. Poplar tree (5)
6. Somewhat hungry (British) (7)
7. A South American bird (5)
8. Protection from harm (7)
14. Found in a "standard" car (9)
16. Steady (9)
17. An artistic movement in 19th century France (7)
18. Thievery (7)
20. Perform surgery on (7)
21. A North American time zone (7)
23. Acquire knowledge (5)
24. Water nymph (Greek mythology) (5)