Answer:

MOAT

AnswerCrossword Clue
MOATCastle defense
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
MOATProtective channel
MOATSiege defense
MOATZoo barrier, sometimes
MOATWet circle
MOATDrawbridge necessitator
MOATCastle-defense measure
MOATCastle protector
MOATView from a drawbridge
MOATMedieval invaders' obstacle
MOATModern zoo barrier
MOATWhat a drawbridge crosses
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
MOATDrawbridge site
MOATOld security device
MOATBarrier at a zoo
MOATMedieval security system
MOATProtective trench
MOATMedieval attack deterrent
MOATDefensive trench
MOATMedieval invader's obstacle
MOATWall alternative, perhaps