use an item frame and put the clock in it, this works with any item, including maps
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You can't do that. Notch named clocks wrong, they are actually watches.
Originally clocks were simply intended for you to carry them in your inventory, you could see if it was light or dark by just looking at it, useful for when you're mining during the night. However now you can create an Item Frame and put that on the wall, and then place the clock on the item frame, making it into a wall clock.
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.
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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