A wrong to right (4)
I believe the answer is:
tort
'a wrong' is the definition.
(legal term)
'to right' is the wordplay.
'right' becomes 'rt' (**).
'to'+'rt'='TORT'
(Other definitions for tort that I've seen before include "A private or civil wrong that may attract damages" , "Legal wrong for which damages may be sought" , "Act for which damages can be claimed" , "Private or civil wrong in law" , "Legal wrongdoing" .)