From The Enigma
NPL Magazine - Nov/Dec 2010
GROUCHO  (adapted)

"I'll bet you can't steer that 12345678
Along this cold, 345 street."
He tried, but every time he did,
He landed on his seat.
At last he had to holler, "12678!'
I must admit defeat."

HINT:
345 = ICY

Answer:

UNICYCLE
ICY
UNCLE