Pronounce not guilty of a crime (9)
I believe the answer is:
exonerate
'pronounce not guilty of a crime' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for exonerate that I've seen before include "Discharge" , "Declare to be blameless (9)" , "Release" , "Free of duty" , "Declare to be free from blame" .)