Related Clues:

• Cousin of "ahem"
• Conversation starter of a sort
• "Hey . . . over here!"
• Surreptitous sound
• Low 'Yo!'
• "Hey!" relative
• 'Look this way'
• Exclamation repeated in the Monkees' TV theme song
• Common 60-Across
• Quiet call for attention
• Whispered exclamation, a call to attract attention
• Listen here to psalm written by holy man!
• Penny's way to attract attention?
• Vessel in gym's used to attract attention
• A summons from the ambassador to Yard