Answer: tripper

AnswerCrossword Clue
TRIPPERDancer of a kind
TRIPPERFall initiator, perhaps
TRIPPERFall guy?
TRIPPERBeatles "Day ..."
TRIPPERBeatles hit: "Day ..."
tripperone who trips (to stumble (to trip when walking or running))
tripperA person who goes on a pleasure trip or excursion
tripperA device that triggers a signal or other operating device