Wrong chapter held by rector in training (9)
I believe the answer is:
incorrect
'wrong' is the definition.
(I know that wrong can be written as incorrect)
'chapter held by rector in training' is the wordplay.
'chapter' becomes 'c' (abbreviation).
'held by' indicates putting letters inside.
'training' indicates an anagram (to train can mean to grow something into a shape).
'rector'+'in'='rectorin'
'rectorin' anagrammed gives 'inorrect'.
'c' inserted within 'inorrect' is 'INCORRECT'.
(Other definitions for incorrect that I've seen before include "Place of refuge" , "Not accurate" , "Erroneous" , "False, wrong" .)