Crossword Genius

Castle protection (4)

Ross

I believe the answer is:

'castle protection' 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 "Ditch used as a defence" , "Water-filled ditch around stronghold" , "Water defence" , "Last ditch defence?" , "Water crossed via a drawbridge" .)

I've seen this clue in the USA Today, The Mirror and the LA Times.
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