A vote: Odin’s first for God! (6)
I believe the answer is:
apollo
'god' is the definition.
(Apollo is a Greek god)
'a vote odin's first' is the wordplay.
'vote' becomes 'poll' (polling is a kind of voting).
'odin's first' becomes 'o' (1st letter of 'odin').
'a'+'poll'+'o'='APOLLO'
'for' acts as a link.
(Other definitions for apollo that I've seen before include "US space program" , "London theatre" , "Greek (and Roman) god of light, poetry etc" , "Greek god (twin brother of Artemis)" , "God of light and US space programme" .)