Crossword Genius

We use these for chewing (5)

Ross

I believe the answer is:

teeth

(Other definitions for teeth that I've seen before include "They're to be found on a gear-wheel" , "One may be armed to them" , "Gearwheel cogs" , "Incisors maybe" , "rarely a hen's" .)

I've seen this clue in the Sydney Morning Herald.
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