Cryptic crossword No 4,090

Across

1. Ultimately team launches comeback for last-minute lead? (5)
2. Support comes from banks not participating in summits (4)
3. Finally acquired flood rescue vessel that's badly lit (4)
4. Agency worker abused deer and is restrained (8)
5. Graduation problem is to be eliminated (6)
6. Well-built schoolboy's content to be a shit (6)
7. On the way back, the French from Chester maybe had a leak (5)
8. Headcase mostly liked heartless old Sinn Fein leader's shenanigans (11)
9. It could be hook a duck's something to have fun with? (4,4)
10. Journalist hounds ridiculously soft inspector (6)
11. No space for alien transporter left inside chemical base (6)
12. Without favouring author, titanic figure turns to praise briefly as expected (3,5)
13. A grand day out? (4)
14. Impressively large JPEG? (4)
15. Take advantage again of facility in Champagne city centre's terminus (8)

Down

1. Over time fellow identifies faults (7)
2. Extravagant accommodation for refugees? (4)
3. Stay up after getting end away, being dirty (4)
4. Cut with glucose primarily, supply crack that often makes you laugh (8,4)
5. Understand the cost for Spooner, correct? (7)
6. Various people scattered with snake interrupting radio broadcast on Sunday (9)
7. Naval force remains unexpectedly after August (5,7)
8. Old playground in Tyne & Wear abandoned for one with light? (5,4)
9. To begin with researchers obviously underestimated the English way (5)
10. Previously released interloper befriended reporters essentially (7)
11. Soldiers did well and were intimidating (7)
12. Charlie met with guards (4)
13. Display house in Cornwall? (4)