Related Clues:

• ''I'm talking to you!''
• Hushed "Hey you!"
• "Pay attention!"
• 'Hey, over here ...'
• Hushed ''Hey you!''
• Sibilant "Hey!"
• Soft "Hey!"
• Sound before 'Your fly's open'
• 'Over here'
• Start of a whispered comment, perhaps
• Subtle 'yo!'
• ''You there!''
• 'Hey . . . over here!'
• Sibilant signal
• Subtle alert