Related Clues:

• Sound before 'Your fly's open'
• A serious one may be red
• Storm warning
• 'Over here'
• Start of a whispered comment, perhaps
• Subtle 'yo!'
• ''You there!''
• 'Hey . . . over here!'
• Sibilant signal
• Emulate Paul Revere
• Subtle alert
• "Fore!" for one
• Relative of ''ahem''
• Soft "Yo! Over here!"
• Give a heads-up to