Examination in Art is erroneously withdrawn (5)
I believe the answer is:
resit
'examination' is the definition.
(I've seen this before)
'in art is erroneously withdrawn' is the wordplay.
'in' indicates a hidden word.
'withdrawn' shows that the letters should be reversed in order.
'tiser' is hidden in the letters of 'art is erroneously'.
'tiser' reversed gives 'RESIT'.
(Other definitions for resit that I've seen before include "Retake exam" , "second try at test" , "tested again" , "second exam" , "Take examination again" .)