Crossword Genius

Aquatic protection (4)

Ross

I believe the answer is:

moat

(Other definitions for moat that I've seen before include "Trench around building" , "Ditch used as a defence" , "A deep water-filled ditch around a castle" , "Water crossed via a drawbridge" , "Water around castle" .)

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