Crossword Genius

Extract marijuana plant (8)

Ross

I believe the answer is:

milkweed

'plant' is the definition.
(milkweed is a kind of plant)

'extract marijuana' is the wordplay.
'extract' becomes 'milk' (milking is a kind of extracting).
'marijuana' becomes 'weed' (synonyms).
'milk'+'weed'='MILKWEED'

I've seen this clue in The Independent.
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