Character in Greek mythology bound to a perpetually turning fiery wheel by Hermes on the orders of Zeus (5)
I believe the answer is:
ixion
(Other definitions for ixion that I've seen before include "He was bound to go round endlessly" , "Long-suffering mythical king" , "King bound by Zeus to a turning wheel" , "Legendary king" , "King punished - bound to a wheel" .)