Illicit sort of coffee bar (5)
I believe the answer is:
black
I believe this clue is a triple definition!
'illicit' is the first definition.
(eg the black market)
'sort of coffee' is the second definition.
(black coffee is a coffee without milk)
'bar' is the third definition.
(to black certain goods is to boycott them)
(Other definitions for black that I've seen before include "-- Monday" , "It produces illegally undeclared income" , "What's written on in the classroom" , "Dirty" , "Extremely dark" .)