There’s something about the No. 7 that marks major changes for PricewaterhouseCoopers’ Terri McClements. 1987 marked her first year with the Big Four accounting firm. In 1997, she made partner. And 2017 brought yet another expanded role: After three years as PwC’s Washington metro managing partner, McClements was promoted to Mid-Atlantic managing partner, expanding her responsibilities to more than 6,000 employees across Greater Washington, Philadelphia, Baltimore and Richmond from her McLean…