A philosopher’s postgraduate study? (5)
I believe the answer is:
bacon
'a philosopher's' is the definition.
(Francis Bacon)
'postgraduate study?' is the wordplay.
'postgraduate' becomes 'ba' (I can't explain this - if you can you should give a lot more credence to this answer).
'study?' becomes 'con' (con can informally mean to study).
'ba'+'con'='BACON'
Can you help me to learn more?
(Other definitions for bacon that I've seen before include "early scientist" , "Artist - meat" , "modern artist" , "Pig meat N essayist" , "Bring this meat home to be a winner" .)