Kept in vinegar and drunk (7)

I believe the answer is:

pickled

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'drunk' is the definition.
(pickled can informally mean drunk)

I cannot understand how the rest of the clue works.

(Other definitions for pickled that I've seen before include "Preserved in liquid" , "Preserved - drunk" , "Brahms and Liszt" , "Blotto" , "Preserved in vinegar or brine" .)

I've seen this clue in The Mirror.

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