Grape originally acclaimed by jazz fan with degree (7)
I believe the answer is:
catawba
'grape' is the definition.
(I know that Catawba is a type of fox grape)
'originally acclaimed by jazz fan with degree' is the wordplay.
'originally' indicates taking the first letters.
'by' is a charade indicator (letters next to each other).
'jazz fan' becomes 'cat' (I've seen this before).
'with' becomes 'w' (abbreviation).
'degree' becomes 'BA' (Bachelor of Arts).
The initial letter of 'acclaimed' is 'a'.
'a' put after 'cat' is 'cata'.
'cata'+'w'+'ba'='CATAWBA'
(Another definition for catawba that I've seen is " Native American".)