Shady, disreputable (6)
I believe the answer is:
louche
This clue is a double definition.
'shady' is the first definition.
(synonyms)
'disreputable' is the second definition.
(similar in meaning)
(Other definitions for louche that I've seen before include "Raffish" , "Appealingly disreputable" , "Questionable or shady, from French" , "Appealingly sordid" , "Disreputable in a rakish sort of way" .)