Fruit that makes dog rave (7)
I believe the answer is:
currant
'fruit' is the definition.
(currant is a kind of fruit)
'dog rave' is the wordplay.
'dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'rave' becomes 'rant' (synonyms).
'cur'+'rant'='CURRANT'
'that makes' is the link.
(Other definitions for currant that I've seen before include "Product of grape" , "Small black raisin" , "Something ideal for jamming" , "Small dried seedless grape" , "Cake ingredient" .)