Answer: alert

AnswerCrossword Clue
ALERTOn the que vive
ALERTSiren or APB
ALERTWake-up call
ALERTOn the qui vive
ALERTOn your toes
ALERTWarning signal
ALERTFully attentive
ALERTWide-awake
ALERTKeenly attentive
ALERTHeads-up
ALERTIt may be red
ALERTNot missing a trick
ALERTPaying attention
ALERTVigilant
ALERTWarning that's often red
ALERTNot asleep on the job
ALERTReady
ALERTBlow the horn at
ALERTAll ears
ALERTReadiness condition
alertvigilant
ALERTStorm siren
ALERTOn the lookout
ALERTWide awake
ALERTArgus-eyed
ALERTCode red, for one
ALERTOn one's toes
ALERTSharp-eyed
ALERTTip off
ALERTWarn
ALERTNot oblivious
ALERTOn the ball
ALERTMacLean's "Red ..."
ALERTWarning
ALERTPut on notice
ALERTFully awake
ALERTNot easy to fool
ALERTIt might be red
ALERTMessage to beware
ALERTNot caught napping