Something used for smoking jacket (6)
I believe the answer is:
reefer
'jacket' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for reefer that I've seen before include "habit?" , "close-fitting garment" , "Nautical jacket" , "In slang, a marijuana cigarette" , "roll of hemp" .)