University supporting case of assisted grant (5)
I believe the answer is:
admit
'grant' is the definition.
(I've seen this before)
'university supporting case of assisted' is the wordplay.
'university' becomes 'mit' (I've seen this in other clues).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'case of' means to remove the middle letters (outsides of).
'assisted' with its middle taken out is 'ad'.
'mit' after 'ad' is 'ADMIT'.
(Other definitions for admit that I've seen before include "receive" , "Usher in" , "Take on" , "Profess" , "Allow to enter; own up" .)