Answer:
Without me everyone would lose their head. What am I?
I am the only thing that place today before yesterday. (one word)
I jump when I walk and sit when I stand. What am I?
I can wake you up in the morning but I require no electricity or winding.
I hold two meanings. With one I may be broken with the other I hold on.
The answer I give is yes, but what I mean is no. What was the question?