Facts not in Genesis (9)
I believe the answer is:
formation
'genesis' is the definition.
(both can mean the creation of something)
'facts not in' is the wordplay.
'facts' becomes 'information' (I've seen this before).
'not' suggests deleting specific letters.
'information' with 'in' taken away is 'FORMATION'.
(Other definitions for formation that I've seen before include "Establishment" , "(Creation of) an organisation" , "Genesis" , "Structure" , "Arrangement of things acting as a unit" .)