Converse, chat (4)
I believe the answer is:
talk
I believe this clue is a double definition.
'converse' is the first definition.
(I know that converse is a more specific form of talk)
'chat' is the second definition.
(I know that chat is a more specific form of converse)
(Other definitions for talk that I've seen before include "Discussion" , "Speak frankly (about the Christmas dinner?)" , "Communicate" , "Idle gossip" , "Gas" .)