Classic British film (3,5,3)

I believe the answer is:

the third man

(Other definitions for the third man that I've seen before include "Graham Greene novel, a famous film" , "Carol Reed film scripted by Graham Greene" , "long sought by British intelligence" , "Film starring Orson Welles" , "Film in which Welles played Harry Lime" .)

I've seen this clue in The Times.

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