Crossword Genius

Defensive ditch (4)

Ross

I believe the answer is:

moat

'defensive ditch' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for moat that I've seen before include "A deep water-filled ditch around a castle" , "Defensive water" , "Ditch dug to protect a castle" , "Trench around fortifications" , "defensive construction" .)

I've seen this clue in the LA Times, the L.A. Times Daily, The Times, the Wall Street Journal, The Washington Post and the Canadiana.
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