Crossword Genius

Major vegetable export of Nigeria (nearly 70% of the world's total)

Ross

I believe the answer is:

yam

(Other definitions for yam that I've seen before include "vegetable plant" , "May be a foreign potato" , "Potato-like vegetable" , "Tropical climber" , "Tropical root vegetable" .)

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