Welsh vegetable? (4)
I believe the answer is:
leek
'welsh vegetable?' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for leek that I've seen before include "Foodstuff" , "One of the veggies" , "Vegetable of the onion family" , "Edible plant, Welsh symbol" , "Onion's relative" .)