Cryptic crossword No 3,295

Across

1. Fight the system when you're 17? (5,2,2,3,3)
2. Rough, unfinished grot (4)
3. Fantastic 4, admitting power, on missing being powerless (8)
4. Over the weekend, a couple listened to trance (4)
5. Daggers that just don't quit? (8)
6. Gauntlet thrown, Guevara seized everything English (9)
7. Chap with a split lip in convoluted piracy drama (7,8)
8. Union due said to protect worker and one lacking confirmation (15)
9. "No Access" oddly absent, go inside for some Chopin (9)
10. Take on feud, negotiations held back (5)
11. Alien survivor, universe-goer, way out! (9,6)
12. Frankie Dettori, unsaddled if taken to ground. (5)

Down

1. Victoria and Albert emptied tub (3)
2. 1 of 5 sits in road, owing to bright headlights perhaps (6)
3. Van Sant's showing you "Restless" at last (3)
4. Free to turn north before spring (7)
5. Critical information about way out? On the contrary (7)
6. Dine out on the way to local (7)
7. Late send-off upset! (3,2,4)
8. Unfortunate cop is hit with a sort of nut (9)
9. Americans trade nothing for a long time (5)
10. Cash in, embarrassed to appear topless (6)
11. Chose pieces specifically with singer teed up outside (7)
12. Is it a crime to use this during a wheel change? (7)
13. Rotten hairdresser left inside, stormed about (7)
14. Fight, raging against cops and security from the outset (6)
15. Think about a really twinkly heart (6)
16. Silence question of capability (3,2)
17. Local setter, foreign letter (3)
18. Doctrine generally exists before mass adoption (3)