Staffs town; vegetable (4)
I believe the answer is:
leek
I believe this is a double definition.
'staffs town' is the first definition.
(I've seen this before)
'vegetable' is the second definition.
(I know that leek is a type of vegetable)
(Other definitions for leek that I've seen before include "Plant (onion relative) eaten as a vegetable" , "Vegetable of the onion family" , "Welsh symbolic vegetable" , "Edible plant, Welsh symbol" , "Staffs. town; vegetable" .)