This vegetable can lose juice I hear (4)

I believe the answer is:

leek

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'this vegetable' is the definition.
(leek is a kind of vegetable)

I can't explain the remainder of the clue.

(Other definitions for leek that I've seen before include "Vegetable symbol of Wales" , "English town" , "Welsh national emblem" , "Vegetable associated with Wales" , "Plant; Welsh emblem" .)

I've seen this clue in the Sydney Morning Herald.

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