Answer:
I work when I play and play when I work. What am I?
I contain five little items of an everyday sort. You can find all five in a tennis court.
I have hands but cannot clap
I run smoother than any rhyme I love to fall but cannot climb.
You find me behind the stars; or in a sixth seventh or third. It takes something round a computer and me to make pie. I am bigger than anything you can think of.
Some try to hide some try to cheat. But time will show we always will meet. Try as you might to guess my name. I promise you'll know when you I do claim.