black comedy

Around that time, Bobcat Goldthwait wrote and directed Bobcat Goldthwait's first film, the black comedy Shakes the Clown, which didn't exactly become a box office smash, but has since become a cult classic, especially among industry people.

in the horror genre

Most commonly characterised as evil for the purposes of film narratives, clowns abound in the horror genre as evidenced by everything from everything to Poltergeist to Rob Zombie’s House of 1000 Corpses and sequel

a well developed horror film

While the concept may sound a bit flimsy, Clown is a well developed horror film.