Buster, Diane or Michael (6)

I believe the answer is:

keaton

(Other definitions for keaton that I've seen before include "Buster ...... was stolid star of silent screen" , "Buster -, silent film comedian" , "Buster -, US film comedian" , "'Buster' of the silent films" , "Buster -, film comedian and director" .)

I've seen this clue in The Guardian.

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