Answer:
What is often returned, but never borrowed/
What runs around all day. Then lies under the bed. With its tongue hanging out?
Round like a dishpan and smaller than a bathtub. But the ocean can't fill it. What is it?
What can you put in a barrel to make it lighter?
Left to right Iām quite bright. Right to left I might bite.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.