Answer: moat

AnswerCrossword Clue
MOATDrawbridge site
MOATBattering-ram countermeasure
MOATWater under the bridge?
MOATCastle circler
MOATZoo sight
MOATDefensive excavation
MOATRing around the castle
MOATWatery trench
MOATCastle fortification
MOATCircular defense
MOATBygone protection
MOATWhat a drawbridge crosses
MOATOld security device
MOATBarrier at a zoo
MOATMedieval security system
MOATProtective trench
MOATMedieval attack deterrent
MOATDefensive trench
MOATMedieval invader's obstacle
MOATWall alternative, perhaps
moatchannel resembling a moat (as about a seamount or for confinement of animals in a zoo)
MOATProtective channel
MOATCastle ditch
MOATProtective ditch
MOATRampart surrounder
MOATCastle protection
MOATMedieval defense
MOATCastle's defense
MOATPart of a castle's defense
MOATWater barrier
MOATWater under the bridge, perhaps
MOATCastle defense
MOATSiege defense
MOATZoo barrier, sometimes
MOATWet circle
MOATDrawbridge necessitator
MOATCastle-defense measure
MOATCastle protector
MOATView from a drawbridge
MOATMedieval invaders' obstacle