Sorry, Yankees ... former MLB All-Star Royce Clayton says the Dodgers will win the World Series -- telling TMZ Sports, "This is the year." Clayton -- who we got out checking the surf in Malibu on Thursday morning -- says it pains him to make the prediction as a longtime S.F. Giant ... but he says…

Manny Ramirez didn't sign his new minor league baseball deal for the cash -- it's because he "doesn't know what to do with himself without baseball" ... so says former MLB star Royce Clayton. 41-year-old Manny just inked a deal with the Chicago Cubs to be a player/coach for its Triple-A affiliate…