This tiny little template doesn't do much more than just "clear" a space around another block of text. Its code could, of course, be incorporated directly into another template that needed a smidgen of clarity, but why bother typing it all out again. Just {{clear}} it all away!
The basic effects can be seen at wikipedia:template:clear.
This template requires the setting of a variable. Three settings are possible:
{{clear|right}}
{{clear|left}}
{{clear|both}}
Despite the category in which this has been placed, this template really doesn't play well with other templates. It shouldn't be incorporated into them. It's basically a fast and dirty way to do a bit of clearing on the fly.