Comic actor Buster (6)

I believe the answer is:

keaton

(Other definitions for keaton that I've seen before include "Buster ...... was star comic of silent screen" , "'Buster' of the silent films" , "Buster ---, silent film comic" , "Buster -, US film actor" , "Buster ...... was poker-faced star of silent screen" .)

I've seen this clue in The Telegraph.

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