The —, 2006 action film starring Michael Douglas and Kiefer Sutherland (8)

I believe the answer is:

sentinel

(Other definitions for sentinel that I've seen before include "Watchperson" , "Guard whose job is to stand and keep watch" , "Guard - ten lines (anag)" , "Watching guard" , "One on guard" .)

I've seen this clue in The Mirror.

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.