Deceiving or fraudulent (9)
I believe the answer is:
This clue is a double definition.
'deceiving' is the first definition.
'fraudulent' is the second definition.
(similar in meaning)
(Other definitions for dishonest that I've seen before include "Fraudulent" , "Not straightforward" , "Mendacious like hedonists" , "Corrupt" , "Crooked" .)