An active talker maybe but his talk is idle (6)
I believe the answer is:
gossip
This clue could be a double definition.
'an active talker' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'but his talk is idle' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'maybe' acts as a link.
Can you help me to learn more?
(Other definitions for gossip that I've seen before include "muck spreader" , "Casual chatter" , "Casual talk about other people" , "Idle prattle" , "Tittle-tattle" .)