Chewed part (3)
I believe the answer is:
bit
I believe this is a double definition.
'chewed' is the first definition.
'part' is the second definition.
(both mean a piece of something)
(Other definitions for bit that I've seen before include "Boring tip of a drill" , "gripped" , "Small portion - part of drill" , "Binary digit; small piece" , "The boring-piece of a drill" .)