Repented raving about Charlie in previous case (9)
I believe the answer is:
precedent
'previous case' is the definition.
(I've seen this before)
'repented raving about charlie' is the wordplay.
'raving' indicates anagramming the letters.
'about' is an insertion indicator.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'repented' anagrammed gives 'preedent'.
'preedent' enclosing 'c' is 'PRECEDENT'.
'in' is the link.
(Other definitions for precedent that I've seen before include "Previous instance (as justification)" , "Earlier parallel event" , "exemplary court case" , "Example to follow" , "Relevant earlier case in law" .)