Crossword Genius

Castle surround (4)

Ross

I believe the answer is:

moat

'castle surround' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for moat that I've seen before include "Ditch used as a defence" , "Last ditch defence?" , "defensive construction" , "Water around castle" , ". . . part of defence" .)

I've seen this clue in The Mirror and the Evening Standard.
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