Smoke jacket (6)
I believe the answer is:
reefer
I believe this is a double definition.
'smoke' is the first definition.
(reefer is a kind of smoke)
'jacket' is the second definition.
(I've seen this before)
(Other definitions for reefer that I've seen before include "Jack < 's joint" , "Kind of jacket - joint" , "Unofficial smoking" , "drug-filled cigarette" , "Double-breasted jacket for a man" .)