Graduate gets prisoner some breakfast (5)
I believe the answer is:
bacon
'some breakfast' is the definition.
'graduate gets prisoner' is the wordplay.
'graduate' becomes 'ba' (someone with a Bachelor of Arts degree).
'gets' is a charade indicator (letters next to each other).
'prisoner' becomes 'con' (abbreviation for 'convict').
'ba'+'con'='BACON'
(Other definitions for bacon that I've seen before include "Meat one can bring home" , "friar" , "gammon" , "Salted and smoked pig meat" , "The meat to bring home for success" .)