Welsh emblem (4)
I believe the answer is:
leek
'welsh emblem' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for leek that I've seen before include "One of the veggies" , "Vegetable - Welsh symbol" , "what Fluellen wore in France?" , "Cylindrical vegetable" , "Vegetable emblem of Wales" .)