Believed to be guilty but without proof (9)
I believe the answer is:
suspected
'believed to be guilty but without proof' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for suspected that I've seen before include "Fancied" , "Believed likely or distrusted" , "Doubted the truth of (something)" , "Believed to be the case" , "Believed to be guilty but without proof" .)