Knight after wild party bird (5)
I believe the answer is:
raven
'bird' is the definition.
(I know that raven is a bird)
'knight after wild party' is the wordplay.
'knight' becomes 'N' (chess abbreviation).
'after' says to put letters next to each other.
'wild party' becomes 'rave' (a dance party).
'n' after 'rave' is 'RAVEN'.
(Other definitions for raven that I've seen before include "Flier" , "Large bird of the crow family" , "Black crow" , "Large blue-black bird" , "Glossy black colour" .)