Note wrong answer is given (6)
I believe the answer is:
retort
'answer is given' is the definition.
I can't judge whether this definition defines the answer.
'note wrong' is the wordplay.
'note' becomes 're' (as in do-re-mi).
'wrong' becomes 'tort' (a civil wrong in law).
're'+'tort'='RETORT'
Can you help me to learn more?
(Other definitions for retort that I've seen before include "A quick, sharp reply" , "Witty/sharp reply" , "Answer sharply" , "Sharp response; lab item" , "Riposte, reply" .)