A fellow's a fine fellow (6)
I believe the answer is:
adonis
'a fine fellow' is the definition.
(Adonis can mean an attractive man)
'a fellow's' is the wordplay.
'fellow's' becomes 'don is' (don can mean a university fellow).
'a'+'donis'='ADONIS'
(Other definitions for adonis that I've seen before include "legendary Greek noted for good looks" , "male looker" , "Fit bloke" , "Legendary lover" , "No aids (anag)" .)