An active talker maybe but the talk is idle (6)
I believe the answer is:
gossip
'an active talker' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for gossip that I've seen before include "Casual chatter" , "'Rumours, scandal (6)'" , "Malicious talk about other people" , "Chin-wag, chit-chat" , "(Malicious) report about the doings of others" .)