Related Clues:

• Audience member
• Snoop
• Look through a keyhole
• Peeper
• Good looker?
• Look in (on)
• Le Carré staple
• Watch secretly
• Finder of secrets
• Mole, maybe
• Nosy sort
• Bug someone, e.g.
• Catch a glimpse of
• Nosey Parker
• Trial judge, e.g.