Cryptic crossword No 3,919

Across

1. Bad, bad sign for corporation (7)
2. Gathers hedonists (5)
3. Hope toast is spoilt for manipulator (9)
4. Mob get about Tyneside producing corruption (8)
5. Everyone embraced by Yank is fat! (6)
6. Wife is on the side of US city’s legal profession (3)
7. First offer belongs initially to key-holder (3)
8. Observed after former pupil surrendered (6)
9. Troubled minions have a sleep disorder (8)
10. Innocent tiny lout runs around Gateshead (3,6)
11. Rule as Niger falls apart! (5)
12. Put in order to destroy trees lining back road (7)
13. Unknown opportunist is first in court (8)
14. Two small boys vanished in the heat (6)
15. The French lad’s tutorial (6)
16. Learn yoga moves without beginning to ride in B-29 (5,3)

Down

1. Provocation in Morning Star, perhaps (3,3)
2. Physician and monarch are coming together... (7)
3. ...Doctor loses race to get dish (9)
4. Swindle some inside valley (6)
5. Trot bile out in book (8)
6. Drop Bob and Penny outside court (5)
7. Went past and finished Hobbit (8)
8. Small divorcee gets it (3)
9. Obnoxious men get payment after injury (9)
10. Dated nothing initially but single tall European leaders (8)
11. Confessed now to journalist about road races (8)
12. Attack well! (3)
13. Clues found partly behind ice store (7)
14. Young girls get first letters from naïve young men proposing house shares (6)
15. Upsets son with any changes (6)
16. Redhead is involved in present swindle (5)