Crossword Genius

South American tree in the family Lecythidaceae that has the same name as its edible seed (6,3)

Ross

I believe the answer is:

brazil nut

(Other definitions for brazil nut that I've seen before include "that's hard to crack?" , "Hard thing" , "it's hard to swallow" , "Fruit with a shell - run a blitz (anag)" , "source of protein" .)

I've seen this clue in The Independent.
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