Answer: signaler

AnswerCrossword Clue
SIGNALEROne giving a cue
SIGNALERWigwagger.
SIGNALERUser of semaphores.
SIGNALERSemaphore expert.
SIGNALERSemaphorist.
SIGNALERCohort for Paul Revere
signalerone that signals (to notify by means of communication)