Potter's Clay Meaning

(idiomatic) (Bible) A nation or kingdom.

Example: The clay used by a potter.
I am the potter’s clay
We are but potter’s clay
1611. Old Testament, King James Version, Daniel 2:41:
  And whereas thou sawest the feet and toes, part of potters’ clay, and part of iron, the kingdom shall be divided.
1971. Old Testament, NASB Version, Daniel 2:41:
  In that you saw the feet and toes, partly of potter’s clay and partly of iron, it will be a divided kingdom.