'Who is that fat clown?'

He was a large, fat clown.

You became the strong man, I the fat clown.

That fat clown had my nerves frayed already.

References in the text indicate that the clown character Pompey Doodle is a fat clown, a kind of part that Rowley repeatedly wrote for himself to play.

Big fat clown, naive and illiterate, who spends his time floating around in cloud-cuckoo-land.

Sam is the fat clown.

He realized with sudden grief that he could not take the little fat clown with him-nor had he made any arrangements for his welfare.

He's just some fat old clown who makes people feel smug at Hogswatch!