Narcotic product extracted from tree ferns (6)

I believe the answer is:

reefer

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'narcotic' is the definition.
(reefer is a kind of narcotic)

'from tree ferns' is the wordplay.
'from' indicates the answer is hidden within the clue.
'REEFER' can be found hidden inside 'tree ferns'.

'product extracted' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for reefer that I've seen before include "Jacket - joint - cargo vehicle" , "Type of jacket - smoke" , "drugged cigarette" , "habit?" , "drug-filled cigarette" .)

I've seen this clue in The Times.

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