Welles' media mogul (4)
I believe the answer is:
kane
(Other definitions for kane that I've seen before include "1941 cinematic citizen" , "Great Orson Welles movie 'Citizen . . . .'" , "Orson Welles's film ` `Citizen ....' '" , "'Citizen . . . .', great film by Orson Welles" , "Famous film by Orson Welles 'Citizen . . . .'" .)