CHARLOTTE — North Carolina’s second largest school system has suspended its superintendent with pay but without saying why. A statement from Charlotte-Mecklenburg School on Monday confirmed that Superintendent Clayton Wilcox was suspended, but the statement didn’t say when it happened and it provided no additional details. Wilcox received a two-year contract extension, to 2023, at a salary of $307,000, in January. Wilcox has been on the job for two years. CMS chief engagement officer and ombudsman Earnest Winston will serve as acting superintendent.