Talk ending in sympathy with maker of ’omburgs? (6)

I believe the answer is:

yatter

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'talk' is the definition.
(to yatter is to talk or chatter)

I can't explain the rest of the clue.

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

I've seen this clue in The Guardian.

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