Related Clues:

• Not perfectly round
• Elliptical
• Egg-shaped
• Egglike
• Watermelon-shaped
• 'Nothing with nothing in it', a line like Humpty Dumpty
• Egg-shaped, as circle not filled with a line
• Duck I'd bagged in appropriate location's eggy
• Like London's City Hall
• Just like Humpty Dumpty to clear everything away from wall?