Acquit, pardon (7)
I believe the answer is:
absolve
I believe this is a double definition.
'acquit' is the first definition.
(I've seen this before)
'pardon' is the second definition.
(I've seen this before)
(Other definitions for absolve that I've seen before include "Grant remission of sins" , "Declare (someone) free of guilt" , "Clear of blame or guilt" , "Set free from guilt" , "Discharge" .)