Immoral, dishonest (7)
I believe the answer is:
corrupt
This clue is a double definition.
'immoral' is the first definition.
(similar in meaning)
'dishonest' is the second definition.
(similar in meaning)
(Other definitions for corrupt that I've seen before include "rot" , "Lacking in integrity" , "Criminal" , "Wicked; rotten" , "Dishonest or immoral" .)