Punish, in this case wrongly (8)
I believe the answer is:
chastise
'punish' is the definition.
(I've seen this before)
'this case wrongly' is the wordplay.
'wrongly' indicates an anagram.
'this'+'case'='thiscase'
'thiscase' with letters rearranged gives 'CHASTISE'.
'in' acts as a link.
(Other definitions for chastise that I've seen before include "discipline" , "Severely reprimand" , "Whip perhaps" , "Scold severely" , "Berate" .)