Possible Clues:

• Egglike
• Like an egg round nothing
• Like an egg? Roman poet swallows one
• Like planetary orbits
• Ring with no diamonds, say, shaped like distorted circle
• Nothing and nothing more in the shape of an egg
• Out of round
• Egg completely empty - but it's still this?
• Nothing empty in something that's egg-shaped
• Nothing repeated like eggs!