Related Clues:

• Field of activity
• Arena
• Round figure
• It's a ball
• Sideless solid
• Baseball, but not football
• Bubble, e.g.
• Disco strobe, e.g.
• World
• Earth's shape
• Field of knowledge
• It's round all over
• 1987 Michael Crichton best-seller
• Bubble's shape
• Round shape