Actor Lamorne of Fox's "New Girl"

MORRIS

This Parks and Recreation guest star also played Winston’s quirky roommate on a hit sitcom.

This clue refers to Lamorne Morris, the actor best known for playing Winston Bishop on the Fox sitcom New Girl. The answer is simply his last name, "MORRIS," which fits the grid. Since the clue gives his first name and the show’s title, it’s a straightforward reference without any wordplay or hidden meaning.