Related Clues:

• Observant
• Age blue jeans
•     Movie shot
• Red state?
• Like a worthy watchdog
• Having heightened senses
• APB, for one
• Lose intensity
• A serious one may be red
• Storm warning
• Emulate Paul Revere
• "Fore!" for one
• Give a heads-up to
• Readiness condition
• Become less bright