Related Clues:

• Sphere of influence
• Ruler's breadth
• It's a ball
• Sphere of activity
• Sideless solid
• Baseball, but not football
• Bubble, e.g.
• Disco strobe, e.g.
• World
• Earth's shape
• It may be eminent
• Area of authority
• The sea, to Poseidon
• Field of knowledge
• Special province