Christopher who played Superman (5)
I believe the answer is:
reeve
'christopher who played superman' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reeve that I've seen before include "mate of the ruff" , "Female ruff; also a bailiff" , "Chief magistrate of a district" , "Steward who told a Tale" , "Former shire official" .)