Person who writes of a universal god (6)
I believe the answer is:
author
'person who writes' is the definition.
'a universal god' is the wordplay.
'universal' becomes 'u'.
'god' becomes 'thor' (Thor is an example**).
'a'+'u'+'thor'='AUTHOR'
'of' acts as a link.
(Other definitions for author that I've seen before include "Originator" , "Generator, writer" , "Ours wrote as Edward" , "One writes" , "Originate" .)