Related Clues:

• Obstruction in built-up area
• Mass of wood etc - set of buildings
• Lego piece
• Tetris piece
• Solid shape; prevent
• Obstruct; nearer the back
• City area; prevent flow
• Back stop
• Prevent (progress)
• Obstruct building development
• Prevent, obstruct
• Delay the progress of
• Solid lump
• Hold up from coach in derailment
• Rear royal figure to stop progress