Crossword Genius

Defense from some attackers (4)

Ross

I believe the answer is:

moat

(Other definitions for moat that I've seen before include "Defensive water-filled ditch" , ". . . part of defence" , "Trench around fortifications" , "Castle's ditch" , "Trench round a castle" .)

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