Cryptic crossword No 3,721

Across

1. Ballard perhaps getting to grips with unusually late holiday hangover (3-3)
2. A cat howled for group of birds (4)
3. Antelope chimp alarmed somewhat (6)
4. Direct lecturer to return (3)
5. Professors have talent (7)
6. A slum constructed for savages (5)
7. Car company located in Texas (6)
8. Discovered benefactor sold body (5)
9. Upflow intermittently reveals something in the air (3)
10. Staggeringly clear win for tennis ground? (4)
11. Bureaucrats discovered water (3)
12. Eagerly accepted moving part about becoming German (4)
13. Occasionally spurn star (3)
14. Complain bitterly about dishonest fellow (4)
15. React emotionally to topless slippery character (3)
16. Greg, perhaps holds back the tide (4)
17. Relating to the root of the words 'anxiety', 'microaggression', 'guarded' (6)
18. Shooter - female, following first person out of Uffizi (3)
19. Spencer perhaps could be Grey (4)
20. Afford to acquire sulphur? Its in short supply (6)
21. Secure like America's legendary flyer (7)
22. Scots expressing surprise about forthcoming prisoners (3)
23. Police not starting procedures (3)
24. Number one in Paris, first to admit length of part of speech (6)

Down

1. One cast away from vineyard south of Evreux initially (6)
2. Lady's party in Cockney language (4)
3. Hero that woman clues badly (8)
4. Carelessly names intelligence group (5)
5. Prisoners squeal running into a similar group (13)
6. Lead soldier essentially secures zone (10)
7. Bull spat out doughnut? (6)
8. Perhaps bear clumsily roams ruin (4,5)
9. 22a comes up after I read about 9d (8)
10. Anomalous pulse seen in night sky (5)
11. These from 22a roast India, perhaps (10)
12. All star group crossing woodland Rome damaged (9)
13. Current measures in campus as copper leaves (4)