Related Clues:

• Narrow vent
• Disconnection
• Cat's eye, at times
• Straight, thin cut
• Unfilled space
• Dental problem calling for braces
• Surgeon's cut
• Inner space
• Sexy skirt feature
• Spectrometer feature
• Long, thin cut
• Cumberland, for one
• Nixon tape mystery
• Chain with threads?
• Buttonhole, essentially