Dried fruit making dog rave! (7)
I believe the answer is:
currant
'dried fruit' is the definition.
(currant is a kind of dried fruit)
'dog rave' is the wordplay.
'dog' becomes 'cur' (both can mean a despicable person).
'rave' becomes 'rant' (synonyms).
'cur'+'rant'='CURRANT'
'making' is the link.
(Other definitions for currant that I've seen before include "Cake ingredient" , "Small dried fruit" , "Extirpate" , "Small dried seedless grape" , "The berry sounds electric" .)