Conductor contains oscillating current (9)
I believe the answer is:
toscanini
'conductor' is the definition.
(Arturo Toscanini)
'contains oscillating current' is the wordplay.
'oscillating' is an anagram indicator.
'current' becomes 'I' (symbol for electric current).
'contains' is an anagram of 'toscanin'.
'toscanin'+'i'='TOSCANINI'
(Other definitions for toscanini that I've seen before include "Music director" , "Arturo --, Italian conductor" , "He conducted" , "Virtuoso conductor" , "Acclaimed Italian conductor" .)