Related Clues:
- 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
- Confidential warning
- 'Don't tell anyone, but...'
- Hushed ''Hey!''
- Attention-getting word
- Classroom nudge
- Sibilant call
- Subtle signal
- Verbal elbow?