Knight presents English bishop with a set of holy books (6)
I believe the answer is:
errant
'knight' is the definition.
(a knight errant was a medieval wandering knight)
'english bishop with a set of holy books' is the wordplay.
'english' becomes 'e' (abbreviation).
'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).
'e'+'rr'+'a'+'nt'='ERRANT'
'presents' acts as a link.
(Other definitions for errant that I've seen before include "Travelling in search of adventure like knight of old" , "Off the mark, wandering" , "looking for adventure" , "Roving" , "Kind of knight who once travelled for adventure" .)