The fellow with name for a bird (3)
I believe the answer is:
hen
'a bird' is the definition.
(hen is a kind of bird)
'the fellow with name' is the wordplay.
'the fellow' becomes 'he' (pronoun for a man).
'with' says to put letters next to each other.
'name' becomes 'n' (common abbreviation e.g. on forms).
'he'+'n'='HEN'
'for' acts as a link.
(Other definitions for hen that I've seen before include "Coop resident" , "Adult female chicken" , "Female bird" , "This party is for women only" , "Clucking female" .)