Civil wrong (4)
I believe the answer is:
tort
'civil wrong' is the definition.
(I know that civil wrong can be written as tort)
This is the entire clue.
(Other definitions for tort that I've seen before include "Small tropical fish" , "A legal wrong open to claim for damages" , "Private or civil wrong - trot after it" , "Private or civil wrong open to damages" , "Private or civil wrong in law" .)