Related Clues:

• See 28 Across
• Remote ancestor?
• Old radio feature
• Stand against a wall
• One can be shown it
• Contrast or volume, on old TVs
• Where to set books
• It's on the way out
• Knickknack holder
• Revolver, perhaps
• Turner on a TV
• Cabinet drawer opener
• Place for a keyhole
• Radio dial
• It'll open doors for you