Crossword Genius

Karuka or pecan (3)

Ross

I believe the answer is:

nut

(Other definitions for nut that I've seen before include "Hard-skinned fruit" , "Head (sl.)" , "Hard shell of a locking device" , "Seed with hard shell and firm kernel" , "Enthusiast (slang)" .)

I've seen this clue in the USA Today.
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