Crossword Genius

Filbert, e.g. (3)

Ross

I believe the answer is:

nut

(Other definitions for nut that I've seen before include "Hard fruit; obsessive" , "Combines with bolt to secure" , "Hard shell of a locking device" , "piece of coal" , "Cashew, for example" .)

I've seen this clue in The Star Tribune and the Penny Press.
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