Related Clues:

• Pay attention
• *Siren ... danger ... perked up
• Street peddler's opener?
• Attention getter
• Warning
• Pay attention to
• Attention-getting sound
• Perceptive
• ''---! The herald ...''
• Sound the tocsin
• ''Hey, bud!''
• Cousin of 'ahem'
• ''Hey, Mac!''
• Call for attention
• Head-turner