Convincing recital (7)
I believe the answer is:
telling
I believe this clue is a double definition.
'convincing' is the first definition.
(thesaurus)
'recital' is the second definition.
(I know that telling is a type of recital)
(Other definitions for telling that I've seen before include "Counting" , "relation" , "influential" , "Powerful; informing" , "briefing" .)