Answer:
What can be forever wound up but never annoyed?
A morbidly-named body of water
There is someone, and there is always another, for without the other, there wouldn't be one
Although my cow is dead, I still beat her. What a racket she makes!
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?