I believe the answer is:
'welles role' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kane that I've seen before include "'Citizen . . . .', great film by Orson Welles" , "Famous film by Orson Welles 'Citizen . . . .'" , "Great Orson Welles movie 'Citizen . . . .'" , "1941 cinematic citizen" , "Orson Welles's film ` `Citizen ....' '" .)