Amend to "punish" (7)
I believe the answer is:
correct
This clue is a double definition.
'amend' is the first definition.
(thesaurus)
'punish' is the second definition.
(I know that correct is a type of punish)
'to' is the link.
(Other definitions for correct that I've seen before include "Set right - punish" , "Accurate" , "Adjust, make right" , "See 6" , "Rectify" .)