Actor embodied outcome of Little Bighorn, according to Spooner (6,6)

I believe the answer is:

buster keaton

'actor' is the definition.
(silent film star)

I can't explain the rest of the clue.

(Other definitions for buster keaton that I've seen before include "old movie star" , "Silent screen star" , "Comic" , "US silent film star" , "silent clown - with 21d" .)

I've seen this clue in The Guardian.

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