Accuse formally (7)
I believe the answer is:
arraign
'accuse formally' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arraign that I've seen before include "Accuse, put on trial" , "Bring to trial" , "Accuse as in court" , "Act against" , "Accuse, find fault with" .)