Crossword Genius

Protective trench (4)

Ross

I believe the answer is:

moat

'protective trench' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for moat that I've seen before include "Trench round a castle" , "Castle surround" , "Water defence" , "Water-filled ditch around stronghold" , "quantity of water" .)

I've seen this clue in the LA Times.
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