Degree study in breakfast food (5)
I believe the answer is:
bacon
'breakfast food' is the definition.
(I've seen this before)
'degree study' is the wordplay.
'degree' becomes 'ba' (Bachelor of Arts**).
'study' becomes 'con' (I've seen this before).
'ba'+'con'='BACON'
'in' acts as a link.
(Other definitions for bacon that I've seen before include "Bring this meat home to be a winner" , "Artist - meat" , "gammon" , "Eg, rashers" , "Meat - essayist - painter" .)