Cryptic crossword No 3,742

Across

1. Croat, possibly one appearing in 8 23? (5)
2. Railroad, or Spooner's company decline (7)
3. Olive needing treatment - sign here (8)
4. Odds-on, therefore first of runners to get backer (7)
5. I'm reckless with cost for 8, maybe (6)
6. Engaged, so ended call (4,2)
7. Water-retention device found by student in diet scandal? (9)
8. Bird is regrettably confined (5)
9. Mennonite author wins hearts (5)
10. Wonder Woman, say, has American backing for each organisation initially accommodating her (9)
11. Cage, perhaps for 29 (7)
12. Humid current circling close to equator (8)
13. Expose former partner greeting hunk (7)
14. Conflict when writer's outspoken (3)
15. Origin for ears or lip? (5)

Down

1. 8, deciding factor at Agincourt? (3,7)
2. Whinge occasionally creating faux shock (3)
3. Fragment of audiotape (4)
4. Listener article? (3)
5. Rotten, rotten noise with 29 for 8 (10,6)
6. Nothing stops medics getting drinks (8)
7. Newspapers with covers concealing nothing hit back first (8)
8. See 14d
9. Drama serials often are popular on first showing (4)
10. Compositions of letters heard (6)
11. Likely to be somewhat adaptable (3)
12. Festival's holding conclusion for 8 (10)
13. Spies nothing? Goodbye! (4)
14. Short article on stream creates excitement (6)
15. Quiet, frequently after opening of sermon (4)
16. Situated next to 8 (10)
17. Shows work taking ages (6)
18. Each having tin-opener, get stuck in! (3)