Related Clues:

• Sound uttered by the secretive
• "Hey ... over here"
• Secret-spilling intro
• 'Hey ... have I got a deal for you!'
• 'Yo!' alternative
• Soft "Hey you!"
• Subtle "yo!"
• ''I've got a secret!''
• Intrusion acknowledgment
• ''Over here!'' whisper
• Whispered summons
• Kin of 'ahem'
• Sound before passing a note in class
• ''Hey, you!'' sound
• Sound from a nook, perhaps