Holliday's West ally (4)

I believe the answer is:

earp

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

I've seen this clue in The Washington Post.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.