Creator of Genesis? (5)
I believe the answer is:
cause
This clue is a double definition.
'creator' is the first definition.
(thesaurus)
'genesis?' is the second definition.
(cause is a kind of genesis)
'of' acts as a link.
(Other definitions for cause that I've seen before include "Genesis" , "It brings about an effect" , "A movement or charity- usually good" , "Producer of an effect" , "Grounds" .)