Dishonest or unscrupulous person (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
rogue
(Other definitions for rogue that I've seen before include "Dishonest man" , "Scoundrel, knave" , "Chap in gallery" , "A dishonest or unprincipled person" , "Impish, likeable person" .)