Watery trenches around castles (5)

I believe the answer is:

moats

(Other definitions for moats that I've seen before include "Trenches around castles" , "Defensive water-filled ditches" , "Fortifications filled with water" , "Water defences" , "what isolate castles" .)

I've seen this clue in the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.