Answer:

ALERT

Answer	Crossword Clue
ALERT	On the ball
ALERT	On the lookout
ALERT	Wide awake

ALERT	Argus-eyed
ALERT	Code red, for one
ALERT	On one's toes
ALERT	Sharp-eyed
ALERT	Tip off
ALERT	Warn
ALERT	Not oblivious
ALERT	Storm siren

ALERT	MacLean's "Red ..."
ALERT	Warning
ALERT	Put on notice
ALERT	Fully awake
ALERT	Not easy to fool
ALERT	It might be red
ALERT	Message to beware
ALERT	Not caught napping

ALERT	All eyes and ears
ALERT	Not missing a trick
ALERT	Siren or APB
ALERT	Wake-up call
ALERT	On the qui vive
ALERT	On your toes
ALERT	Warning signal
ALERT	Fully attentive

ALERT	Wide-awake
ALERT	Keenly attentive
ALERT	Heads-up
ALERT	It may be red
ALERT	On the que vive
ALERT	Paying attention
ALERT	Vigilant
ALERT	Warning that's often red

ALERT	Not asleep on the job
ALERT	Ready
ALERT	Blow the horn at
ALERT	All ears
ALERT	Readiness condition

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.