The Great Stone Face, star of silent films, d. 1966 (6)

I believe the answer is:

keaton

(Other definitions for keaton that I've seen before include "Buster -, film comedian and director" , "Buster -, US film actor" , "'Buster' of the silent films" , "Buster --, comic actor" , "Buster . . . . . ., early film comedian" .)

I've seen this clue in The Guardian.

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