1: Syria going after nurse involved in overthrow; sticky stuff? (4,5)
5: Though run over again, MP hasn't died (5)
8: 19-across, perhaps, bites indeed (5)
9: Very clever fish ain't at sea (9)
11: Mend a split state (11)
13: Short bloke quietly escaped seaweed (3)
14: A revolutionary kind of tire contains a bit of carbide (7)
15: Watch Obadiah attend to customers (7)
17: Horse fly's, um, retreating (7)
19: To be a cowboy in a northern range by the Sound (7)
21: In favor of echoing game call (3)
22: E.g., told story about cave-men (11)
23: and 15A. Watch lead pencil spin crazily as misfortunes may occur. (9,4,6)
24: It might reside in monument! (5)
25: Oddly, derros wont die in water! (5)