Note that the included webfont variants have fairly enormous filesizes (WOFFs: 120K+, SVG: 1.2M+).
Quickly running the .ttf through FontSquirrel at default settings produced versions several times smaller (caveat lector, not sure what glyphs are being stripped out, etc.)
FontSquirrel's generator will strip out a lot of unneeded characters. By default this means including just the basic Latin subset with the main punctuation glyphs. If you look at the character set for Clear Sans (http://www.fontsquirrel.com/fonts/clear-sans) you will see that it includes Cyrillic and Greek letters, among other things like musical notes and smilie faces, so those can be removed if you don't want them (or included if you do).
Quickly running the .ttf through FontSquirrel at default settings produced versions several times smaller (caveat lector, not sure what glyphs are being stripped out, etc.)