Related Clues:

• Furtive 'Hey, you!'
• Alternative to an elbow, maybe
• Quiet "Hey!"
• Sound that summons
• Ahem alternative
• Hissed hey
• "Hey, there!" quietly
• Subtle 'Listen up'
• Subtle "Listen up"
• Quieter "Over here!"
• "Ahem"
• Head-turning whisper
• ''Hey, you!'' whisper
• ''Hey, buddy!''
• Cousin of ''ahem''