Rave partner? (4)
I believe the answer is:
rant
'rave partner?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rant that I've seen before include "Loud and emotional declamation" , "Angry tirade" , "Rail" , "End-of-course exams" , "Bombastically declaim" .)