Related Clues:

• ''Hey!''
• It ain't quite "Hey!"
• ''Hey!'' in a library
• Go-ahead signal
• 'Ain't gonna happen!'
• Covert sound
• Signal from a man in a trenchcoat
• Subtle ''Hey you!''
• Low-key ''Hey!''
• Sibilant attention-getter
• '___! Pass it on ... '
• Sibilant “Hey!”
• ''Wanna hear a secret?''
• Quiet 'Hey!'
• Indication that one is just teasing