Raver ain't wrong and that tells its own story (9)
I believe the answer is:
narrative
'story' is the definition.
('narrative' can be a synonym of 'story')
'raver ain't wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'raver'+'aint'='raveraint'
'raveraint' is an anagram of 'NARRATIVE'.
'and that tells its own' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for narrative that I've seen before include "Storyline" , "Story recounting events" , "Telling a story" , "Popeye's vegetable" , "Report" .)