Again, doctor frees certain cigarettes (7)

I believe the answer is:

reefers

I'm a little stuck... Click here to teach me more about this clue!

'certain cigarettes' is the definition.
'reefers' can be an answer for 'cigarettes' (I have seen 'Illegal cigarettes ' mean 'reefers' so perhaps 'cigarettes' could also mean 'reefers'). I'm unsure of the 'certain' bit.

'again doctor frees' is the wordplay.
'again' becomes 're'.
'doctor' indicates an anagram.
'frees' is an anagram of 'efers'.
're'+'efers'='REEFERS'

Can you help me to learn more?

(Other definitions for reefers that I've seen before include "Cannabis cigarettes" , "Double-breasted jackets" , "Joints (sl.)" , "Illegal cigarettes" , "Sailors' jackets" .)

I've seen this clue in the Sydney Morning Herald.

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