Cryptic crossword No 3,666

Across

1. Activist steals IT, recklessly deleting electronic population data (5,10)
2. Nurse confronts extremes of vulgarity and sin (4)
3. Regularly crude ball striker (3)
4. Finish up retreating bronze tip - with tung oil primarily (3,2,3,2)
5. Professional casings for spaceship exterior do well (7)
6. A French queen essentially really unbalanced (7)
7. Official: most of Italian cheese spiked with water in Paris clubs (10)
8. Required food after cycling in new university League (7)
9. Drunk began gradual parting with rule for swearing (3,8)
10. Ape wanting master's scratch (4)
11. Unvarnished truth is proverbially hard thing to escape (3)
12. Guardian initially follows four outspoken actors in making predictions (11)
13. Sir inflicts prep after revising basic facts (5,10)
14. Plots revolutionary chaos with one son taking overall lead (7)

Down

1. Typically eroded at intervals like an ancient mosaic? (5)
2. Big cheese container served up with fruit (3,6)
3. Current exit is clear (6)
4. Playwright elevated some characters in Keynes' biography (5)
5. Make a bad job of dust pile (5)
6. Turn round centrepiece of charming English painter (7)
7. One kind of point claimed irregularly (7)
8. Crowds bored by old conservative's methods (9)
9. US advisor counts spending time on rejected position (9)
10. Rescue vehicle's lithium-iron battery originally on zero amount discharged (8)
11. Art of optimizing energy from awfully fine hugs (4,4)
12. Accuse every individual tipping one politician (7)
13. Government overwhelmed by definite upswing (5)
14. Respected expert supports never exercising (9)
15. Bird maybe affected by land deprived of rain (7)
16. Marine invertebrate species on floating refuge at last (6)