Related Clues:

• Building add on
• Blueprint add-on
• Shelf-bracket shape
• Angled annex
• Contractor's add-on
• Unfeathered wing?
• Right-angled plumbing joint
• Certain large couch
• Right angle-shaped pipe
• New wing, perhaps
• Perpendicular wing
• Right-angled annex
• Perpendicular extension
• Late start?
• Allen-wrench shape