Knock one out of the park

HOMER

Think of a baseball term named after a famous ancient poet—or the kind of hit that sends the batter trotting all four bases.

"Knock one out of the park" is a baseball phrase meaning to hit a home run, which is also called a "homer" in slang. The clue plays on the double meaning—literally hitting a ball far in baseball and figuratively succeeding big. Since "HOMER" fits both the sporty and casual definition, it’s the perfect answer. The name also nods to Homer Simpson, who famously yelled "D'oh!" but isn’t directly tied to the clue here.