Chief Norse deity (4)
I believe the answer is:
odin
'chief norse deity' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for odin that I've seen before include "God - I nod (anag)" , "Chief god of Scandinavian myth" , "divine figure" , "who's worshipped" , "Old Scandinavian" .)