My first thought on 15 down was RED GUARDS, but I had been rejecting that because I didn't think there was a comma after embarrassed and the 'protects' being third person singular, it just didn't make sense. However, having spent yesterday putting different combinations of letters in the spaces, GUARDS is the only one, so I have just checked again and there is a comma!
However, that makes the last letter of 24 across a U, and I'm giving up on that one!
United supporters returned in chaos (5)
Letters: S - A - U
I wonder if it is an archaic word - I think I can just about remember that it is from the last time the clue occurred, but I could well be wrong.
So if I may have an answer, please, I can write it in … … and consign that piece of paper* to the recycle bag.
* Actually the Cryptic usually takes up two pieces with the last few clues going on to second page.