Toothy talk? (3)

I believe the answer is:

jaw

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'talk?' is the definition.
(I know that jaw is a more specific form of converse)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for jaw that I've seen before include "Part of skull" , "Chat" , "Facial bone" , "Gossip" , "It frames the mouth and holds the teeth" .)

I've seen this clue in the Evening Standard.

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