Related Clues:

• Ancient city protectors
• Labyrinth parts
• Masons' creations
• Solid partitions
• See 10
• See 16
• See 13
• Barriers (with ears?)
• They have ears at roadblocks
• Places for outlets
• Squash court features
• Boundaries, all going in different directions
• Separates (off)
• Settings for murals
• Online university's lack