"Go ___!" (Boston cheer)

SOX

Think of the team that plays at Fenway Park and shares its name with a type of footwear.

This clue references the Boston Red Sox, the city's beloved Major League Baseball team. The blank fills in with "SOX," short for "socks" (as in the team's name), and the phrase "Go Sox!" is a common cheer from fans. It’s a straightforward cultural nod—no wordplay, just a direct shout-out to Boston sports pride.