Just look at what it is showing. The clock only shows if it is day or night, it's only really of any use when you are deep underground, ie, you could choose to mine while it is night time, using the clock to see when it is day before heading back up.
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use an item frame and put the clock in it, this works with any item, including maps
A clock in Minecraft is a handheld item, it can't be placed like a decorative block. However what you can do is craft an Item Frame and put that on the wall, then put the clock on the item frame. That way you then have a wall-mounted clock.
You can't do that. Notch named clocks wrong, they are actually watches.
no
No, not on Minecraft PC. You just use your mouse and keyboard.