Crack expert?

COMIC

["Think of someone who delivers lines meant to split your sides, often found between the pages of a newspaper or on a small stage."]

"Crack expert" is a playful hint for "comic" because it’s a pun on two meanings. "Crack" can refer to a joke or witty remark, and someone skilled at making them is a "comic" (like a comedian). The question mark signals wordplay, so you’re not looking for a literal expert in cracks but a humorist.