Related Clues:

• "Hey there!"
• Not nodding
• Furtive "Hey!"
• "Yo!"
• "Over here," quietly
• 'Look out below!,' e.g.
• "Hey, over here!"
• Way to get noticed
• Awake and aware
• Having pricked ears
• "You there!"
• 'You, there'
• Keen-eyed
• "Hey, over here"
• Like watchmen