Related Clues:

• One staring
• Eyer
• Peeping Tom, for one
• One who observes
• Beholder
• One looking
• One who ogles, e.g.
• Watcher
• Rude observer
• Rude dude, perhaps
• Watchful one
• Flirtatious fellow
• One gazing
• One who ogles
• Assessor