Sharp answer about legal misdeed (6)
I believe the answer is:
retort
'sharp answer' is the definition.
(I've seen this before)
'about legal misdeed' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'legal misdeed' becomes 'tort' (I've seen this in another clue).
're'+'tort'='RETORT'
(Other definitions for retort that I've seen before include "Quick and clever or angry reply" , "Quick rejoinder" , "Sharp riposte" , "Reply sharply, perhaps angrily" , "Snappy reply" .)