Trustworthy, but guilty (11)
I believe the answer is:
responsible
I believe this is a double definition.
'trustworthy' is the first definition.
('responsible' can be similar in meaning to 'trustworthy')
'guilty' is the second definition.
(thesaurus)
'but' is the link.
(Other definitions for responsible that I've seen before include "Liable; trustworthy" , "Answerable, dependable" , "Answerable (for something)" , "To blame" , "Morally accountable for one's behaviour" .)