Related Clues:

• "Hey!" in class
• Sibilant attention getter
• Low-key 'Hey!'
• ''Hey, this way!''
• ''Hey, you . . .''
• ''Hey, Buddy!''
• Discreet summons
• Attention-getting whisper
• Sound for attention
• '--, you!'
• "Yo!" in the library
• ''What's the big idea?''
• Tap-on-the-shoulder alternative
• It ain't exactly "Hey!"
• Sound from a test cheater, say