Compensation concerning gown (7)
I believe the answer is:
redress
'compensation' is the definition.
(I know that redress is a type of compensation)
'concerning gown' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'gown' becomes 'dress' (gown is a kind of dress).
're'+'dress'='REDRESS'
(Other definitions for redress that I've seen before include "Put right" , "set things right" , "Pay" , "Set right - compensation" , "Get back into gear" .)