Answer: alerter

AnswerCrossword Clue
ALERTERMore watchful
ALERTERSiren, for one
ALERTERPaul Revere, for one
ALERTERRevere, once
ALERTERMore on guard.
ALERTERMore watchful.
ALERTERMore vigilant
ALERTERLess sleepy
ALERTERMore attentive
ALERTERMore observant
ALERTERTornado siren, e.g.
ALERTEROne warning
alerterALERT, ready for action
alerterAble to think clearly; intellectually active
alerterQuick to notice any unusual and potentially dangerous or difficult circumstances; vigilant