Lincoln bishop with a set of holy books found to be unorthodox (8)
I believe the answer is:
aberrant
'to be unorthodox' is the definition.
(thesaurus)
'lincoln bishop with a set of holy books' is the wordplay.
'lincoln' becomes 'abe' (Abraham Lincoln).
'bishop' becomes 'rr' (abbreviation for Right Reverend).
'with' is a charade indicator (letters next to each other).
'set of holy books' becomes 'NT' (abbreviation for New Testament).
'abe'+'rr'+'a'+'nt'='ABERRANT'
'found' acts as a link.
(Other definitions for aberrant that I've seen before include "Deviating from what is accepted" , "Morally deviating" , "Unusual" , "Transgressing" , "Going wrong" .)