Cryptic crossword No 244

Across

1. Separated 'flies' and revealed 'files', perhaps (8)
2. Hopefully hard drive (6)
3. You said, "Start with 1 across, that's the best place" (6)
4. Powerless person takes father's place in fight - he moves badly (8)
5. Stayed on set, unnoticed (9)
6. Faces rabbit on Saturday, cycling (5)
7. Saint 'enry's poor fall (7)
8. Head of state takes drug for dinner (6)
9. To consume food and drink is exhausting (4,2)
10. In hearing, it's necessary to recreate a murder (7)
11. S = Fibonacci's Sequence of Numbers, mathematicians taught (5)
12. Shots cure ladies' flu (9)
13. Total plus zero is nothing (8)
14. Juvenile centre demolished to build jail (6)
15. Heartily vouchsafes support for grant (4,2)
16. Is nudity a cause of friction? (8)

Down

1. Perhaps vegan nugget ingredient? (3)
2. Record world leader moving in upstairs (5)
3. Nearly falling awkwardly in tip, baker might need this (5,5)
4. Wipe up - secret suddenly revealed (6)
5. Correct mixture (4)
6. Restructured syndicate in branch (9)
7. Wayward adult person had many partners (5,6)
8. Quick throw here to finish the game? (2,3,6)
9. Loudly colour large sea creatures, subjects for artists (10)
10. Corrupt multinationals dissolved in all evolutionary developments (9)
11. Strained to see 'bad' dog, say, rearing another animal (6)
12. Used to judge brightness of posh blokes undermining Labour leader (5)
13. Quiet at last, all is well (4)
14. In truth, you'll find it hollow (3)