Superhero with a hammer (4)
I believe the answer is:
thor
'superhero with a hammer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for thor that I've seen before include "Germanic deity" , "Norse god of war" , "One of the Norse gods" , "Scandinavian god of thunder and the weather" , "Norse deity" .)