Disreputable loud chef tails off (6)
I believe the answer is:
'disreputable' is the definition.
(similar in meaning)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for louche that I've seen before include "Ignominious" , "Shifty or disreputable" , "Shasy or questionable, from France" , "Appealingly disreputable" , "Seedy" .)