Cryptic crossword No 3,876

Across

1. Reptiles bite cold leaves (eaters discontented) (6)
2. Put bullets in empty gun, smoked joint (6)
3. Support spine (4)
4. Daisy or Mimi maybe? Right call (6,4)
5. Fast, small groups of battleships (6)
6. Hard gust swirling causes incoming air currents (8)
7. Sloppy heart: add time into complex surgical procedure (9)
8. Sounds like pro quartet (4)
9. Richard III seeing kids at first as a hazard (4)
10. Sip celery blended exactly (9)
11. Hungry stoic leads mob in disorderly struggle (8)
12. Holder with no middle, old boy put in cipher (6)
13. Plants ring for a prank in field (4,6)
14. Gloomy Lady Jane (4)
15. Four directions around Germany then new destination in journey through Europe... (6)
16. ...and another after that in a second (6)

Down

1. 'English only speakers' rubbish loons got from malignant leader (9)
2. Visit concession outside for shellfish (7)
3. Narrow part of leg won't start to chafe (5)
4. Join 'Only...' a game (7)
5. Nastily ruin Tom, granddad to Romulus and Remus (7)
6. What to do forever after the wedding, perhaps - maintain one's tranquility? (4,4,5)
7. Ludo's top at 1a steps (7)
8. Logs on to get casual trousers (7)
9. Frustration at core with a people's unkempt exotic tree (4,5)
10. Virtual assistants cross, at no time getting in beers (6)
11. Set forth to play with poets XI (7)
12. Force every other cowbell to jingle evenly (6)
13. Boggle half-heartedly to see spectre (5)