Illicit cigarette (6)
I believe the answer is:
reefer
'illicit cigarette' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reefer that I've seen before include "courses may be reduced by one" , "close-fitting garment" , "Canvas trimmer" , "A wool jacket; a spliff" , "Kind of jacket - joint" .)