Cryptic crossword No 2,903

Across

1. Pushed out university prudes in revolution (7)
2. Grieving after you finally left before noon (7)
3. Ottomans pay for primarily stringed instruments (10)
4. Sample taken from prize alpaca generates enthusiasm (4)
5. Mix kebabs roughly without one and they can be used for stunt riding (3,5)
6. Keep reservists in tight control (6)
7. Written record of revolutionary Angola (6)
8. Black out leek (4,4)
9. It rarely turns out to be about books (8)
10. Orthodoxy generally reveals one of life's building blocks (6)
11. Nothing deleted from error code scrambled film again (8)
12. Left embroiled in rubbish scheme (4)
13. Insert crowbar that's firm (10)
14. Hard mineral is brought back along with lithium and calcium (6)

Down

1. Chap to get older chaps to front organisation (10)
2. Keep everything getting skimmed from the top in barrels (4)
3. Add water if dry heat gets out of control (7)
4. Royal Engineers stage uplifting Lloyd Webber musical on Sunday for agents (15)
5. Reportedly dirty display of church furniture (4,6)
6. Abandon in favour of Japanese spirit (7)
7. Facial hair style rebels going crazy about pot (8,7)
8. Freeing from misguided faith in unlimited loss restructuring (15)
9. IV hole in skin (4)
10. "It's chorizo, Nanny!" belted in perfect harmony (15)