Answer: backseatdriver

AnswerCrossword Clue
BACKSEATDRIVERAnnoying passenger
BACKSEATDRIVERFaultfinding passenger
BACKSEATDRIVERMobile source of criticism
BACKSEATDRIVERObnoxious car passenger
BACKSEATDRIVERAuto didact?