Answer: rab

AnswerCrossword Clue
RABJewish teacher.
RABCroatian island
RABJohn Brown's dog
RABBroccoli ... (Italian turnip)
RABConstant complainer
RABMortar-mixing tool
RABWooden mortar beater
RABJEWISH TEACHER'S TITLE
RABJewish title of respect
RABBeater for mixing mortar
RABDalmatian island
RABMortar beater
RABJewish teacher
RABMortar-mixing device.
RABHebrew teacher.
RABMortar mixer
RABAncient Jewish title.
RABFaithful dog of fiction.
RABAdriatic island.
RABDog of fiction.
RABButler of Britain.
RABNickname for British statesman.
RABCanine in Dr. John Brown's story.
RABBeater used in mixing mortar.
RABDog in a story by Dr. John Brown.
RABJewish title.
RAB"... and his Friends," 1858 dog story.
RABJewish title of respect.
RABMasonic mixing stick.