Cryptic crossword No 3,847

Across

1. Questions troublemakers in possession of dodgy gun (7)
2. US president heads international party for Japanese code of practice (7)
3. This filmmaker has made "violent" into an art (9)
4. Novello yearned primarily to tickle this (5)
5. Single daughter carrying weight initially? (11)
6. Chronic fatigue for audience for Hollywood award (4)
7. Government altering of criteria gets old (9)
8. God-given authority to deduce accurately (6,5)
9. Incentives having limits potentially keeps in check underperformers, at first (7)
10. Outspoken, windy German loathed being excused (10)
11. See 21a
12. Leg dumped right in the auditorium? (5,4)
13. Command to start over coming out of head office (4,3,3)
14. Capital Television air obituary in part (7)

Down

1. Some nag everyone about diet (5)
2. Set out mind-reading's strong focus on internal structures (15)
3. Crueler and more delicious taking time following focus of slander (7)
4. Faltering mob role coming to flourish again (7)
5. Rare Nintendo through needing repair (4,2,3,6)
6. Settle jumpy horse? (4,2)
7. Shut up sewer out of order (4,4)
8. Manipulate Georgia with neglect (8)
9. i has one of these (6)
10. Shun getting drunk beneath 6- or 4-armed god (6)
11. On vacation tequila, concoct idiotic plan (6)
12. It's an accepted truth in academia: complex nuclei forgo cytoplasm ultimately (5)
13. Tipping contents of spindly fish (7)
14. On reflection, America is a regret for a large part of the world (7)