Christopher of "Superman” (5)
I believe the answer is:
reeve
'christopher of superman' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reeve that I've seen before include "magistrate of long ago" , "Medieval official - pass rope through an eye" , "High official" , "Pass a rope through a block" , "estate supervisor" .)