US writer omitting name of apostle in version of Bible (6)
I believe the answer is:
asimov
'us writer' is the definition.
(Isaac Asimov)
'name of apostle in version of bible' is the wordplay.
'name' becomes 'si'.
'of apostle' becomes 'mo' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'version of bible' becomes 'av' (I've seen this in other clues).
'si'+'mo'='simo'
'simo' put inside 'av' is 'ASIMOV'.
'omitting' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
(Other definitions for asimov that I've seen before include "See 22 Down" , "novelist" , "Isaac --, science fiction author" , "Isaac --, sci-fi author" , "He wrote about robots" .)