Surname in the 1946 western "My Darling Clementine" (4)

I believe the answer is:

earp

(Other definitions for earp that I've seen before include "Wyatt - (O.K. Corral)" , "Wyatt -, renowned US lawman" , "Wyatt --, Tombstone lawman" , "Wyatt --, US law officer" , "See 4 Across" .)

I've seen this clue in The New York Times.

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