Crossword Genius

Acorn, for one (3)

Ross

I believe the answer is:

nut

(Other definitions for nut that I've seen before include "needing to get tight?" , "Hard edible seed" , "Cashew, for example" , "Almond, for example" , "Enthusiastic person" .)

I've seen this clue in the USA Today, the New York Times and the Universal.
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