Related Clues:

• Flirt, maybe
• Ogling person
• One making a visual assessment
• One checking out?
• One who's 'just looking'
• Admirer from a distance
• Distant admirer
• One in a box
• Loupe user, say
• Admirer at a distance
• Gawker
• Close observer
• 7-Down user
• Vigilant one
• One being unsubtle, perhaps