I arranged concert about right? Wrong (9)
I believe the answer is:
incorrect
'wrong' is the definition.
('incorrect' can be a synonym of 'wrong')
'i arranged concert about right?' is the wordplay.
'arranged' indicates an anagram.
'about' is a charade indicator (letters next to each other).
'right?' becomes 'r' (common abbreviation).
'concert' put after 'r' is 'rconcert'.
'rconcert' is an anagram of 'ncorrect'.
'i'+'ncorrect'='INCORRECT'
(Other definitions for incorrect that I've seen before include "Erroneous" , "Not accurate" , "Place of refuge" , "False, wrong" .)