Happy New Year, everyone!
Need to answer 25 Across, the clue for which is:-
"Back pocket briefly containing prime breathing aids" (5)
I have A-E-S and, as far as I can see, these letters are correct.
Many thanks, AB and Jazzgirl! That one had me - there I was thinking of something along the lines of "gill"" and "lung" which was far removed from the eventual answer!