In the US, the chief law-enforcement officer in a county (7)

I believe the answer is:

sheriff

(Other definitions for sheriff that I've seen before include "Scottish judge" , "Crown's chief executive in a county" , "County official" , "Head of the posse" , "Crown executive officer in a county (England and Wales) - judge (Scotland) - lawman (US)" .)

I've seen this clue in The Mirror.

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