It's Mr. Teeny, one of Krusty's sidekicks... a chain smoking monkey (who I've noticed doesn't have a tail?). I've always been of the mind that all of the lackeys around Krusty are actually smarter than him... Sideshow Bob, Sideshow Mel, this monkey. That should of been an ongoing B-plot... Have the monkey try to murder Krusty or something, I could see it.
