Castle's watery ring (4)
I believe the answer is:
moat
(Other definitions for moat that I've seen before include "defensive construction" , "Water defence" , ". . . part of defence" , "Protective ditch" , "Castle's ditch" .)
I believe the answer is:
moat
(Other definitions for moat that I've seen before include "defensive construction" , "Water defence" , ". . . part of defence" , "Protective ditch" , "Castle's ditch" .)