Conductor contains transformed current (9)
I believe the answer is:
toscanini
'conductor' is the definition.
(Arturo Toscanini)
'contains transformed current' is the wordplay.
'transformed' is an anagram indicator.
'current' becomes 'I' (symbol for electric current).
'contains' with letters rearranged gives 'toscanin'.
'toscanin'+'i'='TOSCANINI'
(Other definitions for toscanini that I've seen before include "He conducted" , "Bare rock formation" , "Arturo --, Italian conductor" , "Acclaimed Italian conductor" , "Virtuoso conductor" .)