Related Clues:

• Discreet call
• Verbal elbow
• Surreptitious attention-getter
• Call to attention?
• Subdued attention-getter
• ''Can I cut in?'' noise
• ... a cheater in class
• 'May I speak?!'
• Discreet attention-getter
• Sound that may turn heads
• Subtler alternative to ''Yo!''
• It may precede the sharing of a secret
• ''Beg pardon!''
• Subtle "Yo!"
• Verbal break-in