Informal talk with bird (4)
I believe the answer is:
chat
I believe this is a double definition.
'informal talk' is the first definition.
(I've seen this in another clue)
'bird' is the second definition.
(chat is a kind of bird)
'with' is the link.
(Other definitions for chat that I've seen before include "A bird; converse" , "Informal conversations" , "An inconsequential and informal talk" , "Chinwag" , "Friendly talk" .)