I've been looking at this on and off since Sunday afternoon and I've solved three clues (maybe a fourth) with no idea of how to enter them.
Is 1d COLUMBIA?
3a is ALOHA SHIRTS.
A lot of the clues talk about leaving, sacking, expelled, abandoned, quits etc. Is that significant or is it the limited imagination of the clue setter?
Anything to do with the recent exam results?