Crossword Genius

Zoo trench (4)

Ross

I believe the answer is:

moat

'zoo trench' 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 ". . . part of defence" , "Ditch used as a defence" , "Defensive water-filled ditch" , "Trench around building" , "Last ditch defence?" .)

I've seen this clue in the LA Times, the Newsday and the Penny Press.
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