Hiss breaks out about university food (5)
I believe the answer is:
sushi
'food' is the definition.
(sushi is a kind of food)
'hiss breaks out about university' is the wordplay.
'breaks out' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'university' becomes 'U' (abbreviation for university).
'hiss' is an anagram of 'sshi'.
'sshi' placed around 'u' is 'SUSHI'.
(Other definitions for sushi that I've seen before include "Food from Japan" , "Japanese food" , "Japanese cold rice dish" , "cold food" , "Rice, seafood cuisine" .)