Related Clues:

• Scene of much activity
• Where all the workers are female
• Word with line or light
• The limit, perhaps
• Place to dive?
• It's the limit, at times
• Sun setting
• It's the limit for some
• Upper atmosphere
• Cloudy region
• Top of the world?
• Honeybee's home
• What's up
• Where stars shine
• The wild blue yonder