Cryptic crossword No 3,895

Across

1. Unexpected option of boat house originally in Dorset, docked (4,5)
2. End soccer badly for climax (9)
3. Subject's use is at sea (5)
4. Following rules once around bed, I finally snooze (9)
5. Cut lines from cool character (3)
6. Sap's better to come back with heart turned to piece of stone (5)
7. Primary education to begin with state (5)
8. Nearly save on returning stars (5)
9. Grill rib, cycling in fuel when flipping (7)
10. Frenchman's greeting Sir Bono excitedly (7)
11. Injures head of heaving appendage, ending in tears (5)
12. Good form of instrument cut by English Chamber Orchestra (7)
13. Lacking wife, heats up wok, spread from tip to tip? (3,4)
14. "Tango possibly down!", pilots in air notify Commander eagerly (5)
15. Unreasonable way lien may be produced? (3,2,4)

Down

1. Discover leading trio from financial centre for trading (4)
2. Assigns a singular place to sleep, stopping for rest (8)
3. Coordinate with hospital after nearly bad situation (4)
4. Terrible HR keeps gold in the event that I start to comment (8)
5. Repeated sound always in R&B? (6)
6. City brimming with heroin America corrupted (10)
7. Colour in beginnings of drawing, imitating Georgia O'Keeffe (6)
8. Dictator's grain yield (4)
9. Challenged a democrat turned communist (5)
10. Intern lacking time to unravel sports champion's total lack of stress (5,5)
11. Tips from Durham University curate knowledge for dabbler? (4)
12. Zombies are this close to survivor - one second before first couple in entrance! (5)
13. Passivity from one country involving start of conflict (8)
14. Saleswoman always turns up carrying one spare! (8)
15. Communicate having another unknown swelling? (6)
16. Calling from Lower Manhattan's top goon I agitated (6)
17. Face on Financial Times covers (4)
18. Be a sycophant: Involves not demanding! (4)