"The Family Stone" actress Diane (6)

I believe the answer is:

keaton

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

I've seen this clue in The Washington Post.

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