Find not guilty (6)
I believe the answer is:
acquit
'find not guilty' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for acquit that I've seen before include "Exonerate" , "Absolve" , "Free - act" , "Declare (someone) not guilty of a crime" , "Discharge from court - not guilty" .)