The orange-haired figure has been causing quite a stir after roaming the city, sometimes by bicycle and talking in a "creepy" voice.
Oh, and he also appears to have a penchant for scaring the staff in clothes shops and one woman claims she was chased down the street by him.
But those hoping for some Halloween-inspired horror twist are in for some disappointment - apparently it's no more than the shenanigans of a 15-year-old schoolboy.
Andrea Hutchinson, manger of Preloved Portsmouth, a store frequented by the clown, said: "He comes in once or twice a week.
"He just likes to come in and stand there doing his tricks.
"He also goes around the pubs doing magic tricks and he has a wallet which he sets on fire.
"He is harmless. I can understand people being frightened though. But he’s just a kid."
Tell that to these people.
But at least they're not American...