Is Escoffier’s oven set apart? (8)
I believe the answer is:
estrange
'set apart?' is the definition.
(thesaurus)
'is escoffier's oven' is the wordplay.
'is escoffier's' becomes 'est' ('is' in French - Escoffier was a French chef).
'oven' becomes 'range' (I've seen this before).
'est'+'range'='ESTRANGE'
(Other definitions for estrange that I've seen before include "Ten gears (anag.)" , "Drive away" , "Divorce" , "separate" , "Anger set (anag.)" .)