Brooding about god (4)
I believe the answer is:
odin
'god' is the definition.
(Norse god)
'brooding about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'ODIN' is hidden in the letters of 'brooding'.
(Other definitions for odin that I've seen before include "mythological personage" , "Mythological Norse god of war" , "God - I nod (anag)" , "Pagan god" , "Supreme god of Scandanavian myth" .)