Acquit without blame (7)
I believe the answer is:
absolve
'acquit without blame' is the definition.
(absolve from blame)
This is the entire clue.
(Other definitions for absolve that I've seen before include "Let off the hook" , "Fully pardon" , "Declare to be free from blame" , "Lob vase (anag.)" , "Give pardon" .)