Related Clues:

• Sibilant “Hey!”
• ''Wanna hear a secret?''
• Quiet 'Hey!'
• "Hey, check it out!"
• “Check this out!”
• Muffled ''Hey, you!''
• Discreet call
• Verbal elbow
• Surreptitious attention-getter
• Call to attention?
• Subdued attention-getter
• ... a cheater in class
• Have a gander
• Newsstand debut of 1937
• Discreet attention-getter