Crossword Genius

The CO sounds a bit of a nut (6)

Ross

I believe the answer is:

kernel

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'bit of a nut' is the definition.
(edible part of a nut)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for kernel that I've seen before include "Stone" , "Nuts and bolts" , "Contents of shell" , "Edible seed of nut" , "Nut's centre" .)

I've seen this clue in The Globe and Mail.
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