Crossword Genius

Nuts only 40% chewed (4)

Ross

I believe the answer is:

mast

I'm a little stuck... Click here to teach me more about this clue!

'nuts' is the definition.
(mast is the nuts of forest trees)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mast that I've seen before include "Sail carrier" , "One carries the sails of a ship" , "nuts and seeds" , "Pole supporting ship's sails" , "Large transmitter" .)

I've seen this clue in The Times.
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