Crossword Genius

Castle defense (4)

Ross

I believe the answer is:

moat

'castle defense' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for moat that I've seen before include "Water defence" , "defensive construction" , "A deep water-filled ditch around a castle" , "Trench around building" , "Castle's ditch" .)

I've seen this clue in the Penny Press, The Washington Post, The Star Tribune, The New York Times, the LA Times and the King Feature Syndicate.
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