9 across
English
bishop
with
a
set
of
holy
books
misbehaving
(6)
English bishop with a set of holy books misbehaving (6)
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The definition is at the end of the clue.
How the clue works
The definition is misbehaving. Build the answer piece by piece: E for English, then RR for Right Reverend (that's your bishop), followed by A, and finally NT for New Testament (the set of holy books).