An all-time Belmont High School field hockey great graduated last spring. That doesn’t mean this fall’s edition of the Marauders expects a regression. While all-time leading scorer Mackenzie Clarke is now playing at the University of Connecticut, Belmont returns a strong core with hopes of advancing past the MIAA Division I Elite Eight threshold they’ve been, per coach Jess Smith, “stuck” on in recent years. “No step back,” Smith said. A program-record 57 players turned out this fall, including 17…