Veteran judicial staff attorney Tammie Mosley tomorrow will announce that she will be a candidate for Chatham County Superior Court clerk to succeed Dan Massey. Mosley, who has worked for Chatham County Superior Court Judge John E. Morse Jr. for 13 years, will qualify as a Democrat for her run. Meanwhile, Massey, who has been clerk for the past 12 years, today made official what had long been expected –he will retire at the end of his current term on Dec.