Concerning wrong answer (6)
I believe the answer is:
retort
'answer' is the definition.
(retorting is a kind of answering)
'concerning wrong' is the wordplay.
'concerning' becomes 're'.
'wrong' becomes 'tort' (legal term).
're'+'tort'='RETORT'
(Other definitions for retort that I've seen before include "Respond" , "swift return" , "Snappy reply" , "Quick answer - laboratory vessel" , "A sharp reply or vessel used in distilling" .)