Shelter king from stew ingredient (4)
I believe the answer is:
leek
'stew ingredient' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'shelter king' is the wordplay.
'shelter' becomes 'lee' (as in lee side, the side sheltered from wind).
'king' becomes 'k' (abbreviation for king in chess).
'lee'+'k'='LEEK'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for leek that I've seen before include "Plant related to the onion, pair with potato for soup" , "Onion-like vegetable" , "Vegetable emblem of Wales" , "Edible plant, Welsh symbol" , "Vegetable related to the onion" .)