Watery defenses (5)

I believe the answer is:

moats

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

I've seen this clue in The Wall Street Journal and the USA Today.

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.