Cooking us one nice stew (7)
I believe the answer is:
cuisine
'cooking' is the definition.
(eg French cuisine is French cooking)
'us one nice stew' is the wordplay.
'one' becomes 'i' (Roman numeral).
'stew' indicates anagramming the letters.
'us'+'i'+'nice'='usinice'
'usinice' anagrammed gives 'CUISINE'.
(Other definitions for cuisine that I've seen before include "Local cooking style" , "It can be French, Italian or Spanish in a restaurant and tasty" , "Haute . . . . . . . is high-class cooking" , "Culinary art" , "(Regional) style of cooking" .)