Hammer-wielding Norse god (4)
I believe the answer is:
thor
'hammer-wielding norse god' 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 "can be classed as immortal" , "One of the Norse gods" , "Wielder of hammer" , "Son of Odin and Freya" , "Mythical figure" .)