Can you do a "clean install" after an auto update install of 10.10?

Can you do a "clean install" after an auto update install of 10.10?
If yes, how?

I suppose it depends on what you define as a “clean install."
You can erase the startup drive and install Yosemite in Recovery.
Boot into Recovery (cmd-r on startup).
From there, use Disk Utility to Erase the startup volume (Macintosh HD).
Quit Disk Utility, then Install OS X.
You should obviously have a backup prior to attempting this.

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