Wine is used in this sauté with rich cooking (9)
I believe the answer is:
eucharist
'wine is used in this' is the definition.
(bread and wine are offered in the eucharist)
'saute with rich cooking' is the wordplay.
'with' is a charade indicator (letters next to each other).
'cooking' indicates an anagram (cook can mean to falsify or distort).
'saute' after 'rich' is 'richsaute'.
'richsaute' anagrammed gives 'EUCHARIST'.
(Other definitions for eucharist that I've seen before include "Mass" , "church service" , "host" , "Bread and wine" , "Consecrated bread" .)