Cryptic crossword No 2,916

Across

1. Destroy in hate, nail in construction (10)
2. Prison blade, one very quiet at first. (4)
3. See 7a
4. Mail merge changed initials of every recipient to 'vulture' (11)
5. NatSec disturbed by early Soviet positions (7)
6. Incendiary gel not even aflame after little sleep (6)
7. Father's covered in hair, disguising bad things (10)
8. Toilet used by four in a line (6)
9. Fairy, perhaps, whips a gnu? (7-2,6)
10. Risqué acrostic clue? Yeah! (4)
11. Broke after returning gold? Tough (6)
12. Cuckoo pecked at old audio tech (4,4)
13. Continue with game, eg Othello, having power (4,2)

Down

1. Shouts best on board (7)
2. Whatever happens, last of party enters frivolous outlet (2,3,5)
3. Short time spent on vacation, and on student musician (8)
4. Cycling record interrupted by one coconut drink (6)
5. Having no worries about heartless umpire (8)
6. Most pleasant scent drifts around Ilinx (6)
7. Identify measures in measure of Tuscany (4)
8. Hennin, for example, is out of fashion (3,3)
9. University leaves in tree (6)
10. Fruit sounds like it's important, number one (4)
11. Reverse reverse reverse, remove new roots (7)
12. Mischievous brothers notice biscuit (10)
13. Deliver legal document with introductions to the essential nuggets in cursive (11)