Food concession outside university (4)
I believe the answer is:
soup
'food' is the definition.
(I know that soup is a type of dish)
'concession outside university' is the wordplay.
'concession' becomes 'sop' (sop is a kind of concession).
'outside' indicates putting letters inside (some letters go outside others).
'university' becomes 'U' (abbreviation for university).
'sop' going around 'u' is 'SOUP'.
(Other definitions for soup that I've seen before include "First course" , "Cock-a-leekie, for example" , "See 19" , "Mulligatawny or borscht?" , "Bisque, for example" .)