Wild when bible's assimilated by wise man (6)
I believe the answer is:
savage
'wild' is the definition.
(synonyms)
'bible's assimilated by wise man' is the wordplay.
'bible' becomes 'av' (Authorised Version of the Bible).
'assimilated by' is an insertion indicator.
'wise man' becomes 'sage' (sage is a kind of wise man).
'av' inserted inside 'sage' is 'SAVAGE'.
'when' is the link.
(Other definitions for savage that I've seen before include "Brutal" , "Uncivilised, vicious" , "Barbaric, uncivilised" , "Wild, untamed" , "Ferocious" .)