A clean sheet is where the goalkeeper has let in no goals in the entire match. For example a football team wins 2-0. They haven't had any goals against and so it is a clean sheet. Often when a team gets a clean sheet the goalie or defence will get an extra bonus which is why players want a clean sheet.
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A clean sheet refers to a game with no "open frames," the term for a frame that does not result in a strike or a spare. Another way to phrase it would be that it is a game in which every pin is knocked down, except possibly any in the "extra ball(s)" for the 10th frame.
Clean sheet refers to the goal keeper keeping a "clean sheet", i.e. has not allowed any goals into his/her net.