Conductor of an opera replicated in turn (9)
I believe the answer is:
toscanini
'conductor' is the definition.
(Arturo Toscanini)
'an opera replicated in turn' is the wordplay.
'an opera' becomes 'tosca' (Giacomo Puccini opera).
'replicated' indicates the doubling of some letters.
'turn' indicates an anagram.
'in' with letters rearranged gives 'ni'.
'ni' doubled is 'nini'.
'tosca'+'nini'='TOSCANINI'
'of' acts as a link.
(Other definitions for toscanini that I've seen before include "He conducted" , "Virtuoso conductor" , "Maestro" , "Old conductor" , "Acclaimed Italian conductor" .)