First nothing, then terrible noise revealing Norse god (4)
I believe the answer is:
odin
'norse god' is the definition.
(I know that Odin is a norse god)
'first nothing then terrible noise' is the wordplay.
'first nothing' becomes 'o' (O resembles 0. I am not sure about the 'first' bit.).
'then' is a charade indicator (letters next to each other).
'terrible noise' becomes 'din' (a din is a noisy disturbance).
'o'+'din'='ODIN'
'revealing' acts as a link.
Can you help me to learn more?
(Other definitions for odin that I've seen before include "Mythological Norse god of war" , "Supreme god of war in Norse mythology" , "The supreme Norse god and creator" , "Chief god of Scandinavian myth" , "Old Scandinavian" .)