Superhero (6)
I believe the answer is:
batman
'superhero' is the definition.
(DC superhero)
This is the entire clue.
(Other definitions for batman that I've seen before include "Cartoon hero of Gotham City" , "who'd fight crime?" , "Officer's personal servant" , "Superhero - Turkish province and city" , "'British military orderly, with Robin as a sidekick? (6)'" .)