A clock in your dream or vision indicates the importance of time in your life, or in a situation. Another explanation is that the time is up, you are really done with it now. Yet another explanation is experiencing feelings of anxiety or the feeling that you are not on top of things.
An alternative explanation is that the clock stands for longing for the future. Another alternative explanation is the way the clock ticks at home, it doesn't tick anywhere, it gives you a safe feeling that you have brought home from your life or situation.
Dreams and visions in which the clock is stopped tells you that you currently have the feeling that you are literally standing still in your life or situation. Another explanation is that you need more time to get where you want to be.
Yet another explanation is that you are becoming aware that the control in your life or situation may be released more. Sticking excessively to ritual, patterns and fixed things in your life.