Sounds like you didn't flash the xoom root zip file. Make sure that the xoom root zip file is on your sd card and boot back into clockwork recovery, choose to install from a zip file and choose that zip file to flash it. After it's done flashing you should be good to go.
and have you installed one of both apk - supersu - or - superuser -
Last edited by philos64; 14th June 2014 at 02:55 PM.