Cook recipe accessed by upper-class gourmet (7)
I believe the answer is:
epicure
'gourmet' is the definition.
(synonyms)
'cook recipe accessed by upper-class' is the wordplay.
'cook' indicates an anagram.
'accessed by' is an insertion indicator (inserted letters gain access to the word).
'upper-class' becomes 'u' (similar in meaning).
'recipe' anagrammed gives 'epicre'.
'epicre' going around 'u' is 'EPICURE'.
(Other definitions for epicure that I've seen before include "Lover of good food and drink" , "discriminating person" , "A faddist in food and drink" , "Connoisseur" , "Person with refined taste in food and drink" .)