Kind forbidden to punish (4,3)
I believe the answer is:
sort out
'punish' is the definition.
(sorting out is a kind of punishing)
'kind forbidden' is the wordplay.
'kind' becomes 'sort' ('sort' can be a synonym of 'kind'**).
'forbidden' becomes 'out' ('out' can be a synonym of 'forbidden').
'sort'+'out'='SORT OUT'
'to' is the link.
(Other definitions for sort out that I've seen before include "handle" , "Select from others or informally punish" , "Resolve - to put in order" , "clear up" , "Resolve (a problem)" .)