Go crazy (4)
I believe the answer is:
'go crazy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rave that I've seen before include "Enthusiastically favourable review" , "Lively party" , "Rant - noisy, all-night party" , "Laudatory sort of review - quite a rant" , "Pop dance party" .)