Crossword Genius

Source of a South American herbal tea (4)

Ross

I believe the answer is:

coca

(Other definitions for coca that I've seen before include "Drug-producing plant" , "Shrub whose leaves are chewed in the Andes as a stimulant" , "Source of drug" , "Narcotic shrub" , "Shrub yielding drug" .)

I've seen this clue in The New York Times.
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