National emblem of Wales (4)
![Ross](/clue/static/ross-mug.min.png)
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" .)