Went back and did some more bargaining (9)

I believe the answer is:

retreated

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

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

Can you help me to learn more?

(Other definitions for retreated that I've seen before include "given extra medical care?" , "Went back" , "Withdrew from enemy forces" , "Left" , "pulled back" .)

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