Related Clues:

• Honk at, perhaps
• Not asleep on the job
• Storm posting, e.g.
• Warning notice
• Give an alert (to)
• Like a sentry
• Bushy-tailed?
• Red __
• Shoot off a flare, e.g.
• Word often preceded by a color
• Notify of peril
• Alert to danger
• Forewarn
• Blow the horn at
• Bring to the attention of