Chatter; babble (7)
I believe the answer is:
prattle
I believe this clue is a double definition.
'chatter' is the first definition.
(I know that chatter can be written as prattle)
'babble' is the second definition.
(I've seen this in another clue)
(Other definitions for prattle that I've seen before include "Chatter in childish way" , "Inconsequential chatter" , "rabbit" , "Blether" , "Talk inconsequentially" .)