The Clocks palette lets you quickly show and hide clocks.
To hide a clock, Command-click it and drag it out the palette.
To hide a clock, Control-click it and choose Hide from the pop-up menu.
To hide all the clocks except one, Control-click the clock you want to keep visible and choose Hide Others from the pop-up menu.
To show a hidden clock, Control-click any clock in the palette and choose a Show command from the pop-up menu.
To show all hidden clocks, Control-click any clock in the palette and choose Show All from the pop-up menu.