Crossword Genius

Watch over an area by regularly walking around it (6)

Ross

I believe the answer is:

patrol

(Other definitions for patrol that I've seen before include "Make a regular tour to maintain security" , "Be on duty on a beat" , "Part of Scouts troop" , "Scouts or Guides group" , "Move round and keep watch" .)

I've seen this clue in The Guardian.
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