Answer: thehorsesmouth

AnswerCrossword Clue
THEHORSESMOUTHUnquestionable authority
THEHORSESMOUTHUnimpeachable source
THEHORSESMOUTHImpeccable authority
THEHORSESMOUTHJoyce Cary novel
THEHORSESMOUTHSymbol of high authority
THEHORSESMOUTHAlec Guinness classic: 1958
THEHORSESMOUTHSource of firm information