Related Clues:

• Extra room, perhaps
• Cockney's perdition
• Angled extension
• Lower part of a wall
• Shape of a right angle
• Joint groove
• 90-degree shape
• Angular addition
• Plumbing joint
• Old Nick's 'eadquarters?
• 90-degree angle
• Pipe with a bend
• Building addition, sometimes
• Half of a square
• Wainscot