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1.
A slang phrase meaning to strike a blow to the face, where someone's face is their 'clock'.
Steve: Wow john, you blew it there.
John: Oh shut up, or I'll clean your clock.
by Super Cru (C-Baller) September 19, 2008
 
2.
means to thoroughly take someone to task
Brian was spreading false information behind Mark's back, Jared told Mark about Brian then went back to Brian and said " Mark is going to clean your clock!"
by urbal February 23, 2011