Related Clues:

• Peeper's place
• Type of surgery
• Door opening
• Listening post?
• Opening for opening
• Lock opening
• Peeper's place?
• Door feature, maybe
• Opening for a peeping Tom
• Voyeur's vantage
• Lock entry
• Opening for the opener
• Aperture for lock opening
• For what's in bits, see below
• Yale has such a narrow entrance ot it