Cryptic crossword No 3,912

Across

1. Extremely large airport agency brought back moronic engineers (10)
2. Stops talk about government (4)
3. Question I had for queen over trade (4,3,3)
4. Full-time or of painless shifts (12)
5. One stopped king, possibly, and almost ace of hearts (7)
6. Analytical branch to international state (7)
7. Her otic ailment caried dirty pieces (7)
8. We've lost hostage, at last returning with one in possession of spy (4)
9. Act of getting slick meeting done with quiet dropped at noon (10)
10. Ices over bits of fruit fudge slices (4)
11. Good man with physical condition leaving hospital in secrecy (7)
12. What helps me see it regularly in ruins (4)
13. Scatter kelp brines all over the place (10)
14. Wildly exposed whodunnit, perhaps one Christie's beginning to set in hot pool (12)

Down

1. One pressing 26 on the table (4)
2. Drops professor's classes (7)
3. Cap succeeded above a top hat (7)
4. His ways with husband's madly half-hearted (5-5)
5. Lead of sextet left band - how could you leave? (4)
6. Large eardrum at the back of the ear is absorbent (7)
7. Country club with camper overwhelmed by previously called alarm (7)
8. Popular tale having Dicky upset without fail (10)
9. Crumbling one Croatian building's back wall being that of 80 years old (12)
10. Skip, go on a run, then start to moonwalk (4)
11. Money-grubber found in Hoppen, NY - PIN cherished (5-7)
12. Signing on in March, Twitter had corruption of PC - help! (10)
13. Forcing mythical creature in grotto's entrance to lock doors essentially (10)
14. French thanks short soldier (4)