Related Clues:

• Look closely
• Eyeball
• It may be blank
• Use a keyhole, perhaps
• It may be vacant
• Expression
• Look through a keyhole
• Ill-mannered look
• Rude look
• Lady, e.g.
• One may exert pressure
• 'Check this out!'
• Gawk
• Kind of pressure
• It may be glassy or icy