Related Clues:

• Hushed ''Hey you!''
• Sibilant "Hey!"
• Soft "Hey!"
• Sound before 'Your fly's open'
• "Excuse me" noise
• 'Over here'
• Start of a whispered comment, perhaps
• Subtle 'yo!'
• ''You there!''
• 'Hey . . . over here!'
• Sibilant signal
• ''Might I interrupt?''
• Subtle alert
• Doubting sound
• Relative of ''ahem''