Cooking oil means food (8)
I believe the answer is:
semolina
'food' is the definition.
(semolina is a kind of food)
'cooking oil means' is the wordplay.
'cooking' indicates an anagram (cook can mean to falsify or distort).
'oil'+'means'='oilmeans'
'oilmeans' anagrammed gives 'SEMOLINA'.
(Other definitions for semolina that I've seen before include "Hard particles of wheat used in puddings etc" , "Cereal used for puddings" , "pudding ingredient" , "Milled wheat product" , "Is no meal (anag.)" .)