Go back and haggle some more with (7)

I believe the answer is:

retreat

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'go back' is the definition.
('retreat' can be a synonym of 'go back')

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

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(Other definitions for retreat that I've seen before include "The Priory, say" , "Leave - refuge" , "secluded place" , "Back away" , "retirement" .)

I've seen this clue in the Evening Standard.

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