Cryptic crossword No 3,772

Across

1. I, Blitzen, failed to get integrals derived (8)
2. What off-road tires touch primarily accelerating under carriage (6)
3. Kitherth thmothering thon, perhapth? (5)
4. Compare with weed blower reducing one-third its energy (5)
5. Retired threesome nearly broken by Colombian guerrillas, say stealth fighters (8)
6. Globalist measure stops distribution of slimy ads, revealing differences between hemispheres? (14)
7. Town dove discombobulated swallowing penny - gets rejected at ballot box (5,4)
8. Iconic lover not upset - becomes one of the darlings of Tchaikovsky (6,8)
9. Not a single ram has a bit of Hepatitis-A acne? (5)
10. Tar is one about wickedness (5)
11. What widows are doing? Dropping in the matter of unfashionable dying (6,3)
12. Cancel the installer of windows out of Sweden going after Essential Panels (6)
13. More furious losing a new child to produce fathering documentary (8)
14. That woman cups both myself and questionable, charming suitor (8)

Down

1. Rolling most yarn into evenly recycled fiber (5)
2. Leading eavesdropper working mafia goes after Marxist for surrendering again (12)
3. We read you're going back on one country in downfall (9)
4. Backwards Thoth knapsack contains his symbol? (4)
5. Nothing left in the theater evokes tradition (4)
6. A refusal uttered by Frenchman is trickery for the most part - time waiting between booty calls? (9)
7. Scheol regularly at the end of former accountant's livelihood? (5)
8. Brothers, or partial smile by two males (5)
9. Even Rome toppling and imprisoning king is not to occur again (9)
10. It's after Mussolini, say, denied Francis of Assisi in particular to get the swelling of separatists? (9)
11. Perhaps dashing Apollo gives weapons their sheaths and songs without ends (9)
12. West Sudan eliminating second resistance leader to get involved in scheme (5)
13. US recalled flammable natural gas claiming 'Carbon Zero America' is not superficial (12)
14. David's handler endlessly volunteered love first - look (9)