National emblem of Wales (4)

I believe the answer is:

leek

'national emblem of wales' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for leek that I've seen before include "Onion's relative" , "Vegetable symbol of Wales" , "Welsh national emblem" , "Vegetable related to onions" , "Green and white vegetable" .)

I've seen this clue in The Guardian, the Wall Street Journal, The Telegraph and The Washington Post.

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