Crossword Genius

Filberts, e.g. (4)

Ross

I believe the answer is:

nuts

(Other definitions for nuts that I've seen before include "Metal fasteners" , "Mad (slang)" , "Slangily crazy like hard fruits" , "Barmy (colloq)" , "Stun (anag.)" .)

I've seen this clue in the Penny Press.
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