From back of cupboard, finished port (5)

I believe the answer is:

dover

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'port' is the definition.
(English port)

I can't explain the remainder of the clue.

(Other definitions for dover that I've seen before include "Sort of sole" , "The largest English ferry port" , "Kentish port" , "There'll be blue clouds over the white cliffs here" , "White cliffs port" .)

I've seen this clue in The Times.

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