Talk wildly (4)
'talk wildly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rave that I've seen before include "Pop dance party" , "Talk with extreme enthusiasm or wild delirium" , "Modern youth dance - sounds hysterical" , "Rant - noisy, all-night party" , "Rapturous" .)
'talk wildly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rant that I've seen before include "Talk wildly, harangue" , "Shout wildly at length" , "Wild speech" , "Angry tirade" , "Speak wildly and incoherently" .)