Importance of Genesis with new version (11)
I believe the answer is:
weightiness
'importance' is the definition.
(thesaurus)
'genesis with new version' is the wordplay.
'new version' indicates an anagram (I've seen this in other clues).
'genesis'+'with'='genesiswith'
'genesiswith' is an anagram of 'WEIGHTINESS'.
'of' is the link.
(Other definitions for weightiness that I've seen before include "Importance - gravity?" , "being important" .)