When i try and start my car i hear a clacking sound what could this be?

What is your question?

When I first started my car it had been off all day (8hours minimum) and I heard a clacking sound and the car didn't want to start. This was three days ago and it's happened 4 more times. However it doesn't happen everytime.

What makes this problem better or worse?

When engine is cold

How long has your 2007 Hyundai Sonata had this problem?

3 days