Crossword Genius

Obstacle for a would-be castle attacker (4)

Ross

I believe the answer is:

moat

(Other definitions for moat that I've seen before include "A deep water-filled ditch around a castle" , "Ditch dug to protect a castle" , "Water crossed via a drawbridge" , "Ditch round castle" , "Water-filled trench around a castle" .)

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