Talk of a bird (4)
I believe the answer is:
chat
I believe this is a double definition.
'talk' is the first definition.
(thesaurus)
'a bird' is the second definition.
(chat is a kind of bird)
'of' is the link.
(Other definitions for chat that I've seen before include "Gossip" , "Talk casually" , "(13) [FRENCH] Cat" , "Casual conversation" , "Tom in 22 [ALSACE]" .)