Local incessant talk relates to Treaty negotiation (6)

I believe the answer is:

yatter

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'local incessant talk' is the definition.
'yatter' can be an answer for 'talk' (to yatter is to talk or chatter). I am unsure of the 'local incessant' bit.

'relates to treaty negotiation' is the wordplay.
'treaty' anagrams to 'YATTER'.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for yatter that I've seen before include "Talk incessantly" , "Talk endlessly about nothing" , "Go on and on" , "rabbit on endlessly" , "Talk idly" .)

I've seen this clue in The Irish Times.

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