Answer:
As a whole, I am both safe and secure. Behead me, I become a place of meeting. Behead me again, I am the partner of ready. Restore me, I become the domain of beasts.
What is long and slim, works in light. Has but one eye, and an awful bite?
What has 4 eyes but can’t see?
What can answer in any language? What can speak without a mouth? What can sing without an ear?
What stays the same size no matter how much they weight?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.