Related Clues:

• Keeping an eye peeled
• Having perked-up ears
• You might issue one for spoilers
• Well-caffeinated, maybe
• Attentive dealer taking part
• On the ball, shimmying later
• Warning word often preceded by a color
• Urgent notification
• Tornado warning, e.g
• Ready to get beer right before time
• Alarm caused by prince, not British
• Message from an app
• Lively beer Roosevelt drained
• Important notification
• 'Spoiler ___!'