Crossword Genius

The penetrative part? (3)

Ross

I believe the answer is:

bit

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'part?' is the definition.
(bit is a kind of part)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bit that I've seen before include "a curb?" , "chip?" , "which is between one's teeth?" , "Small portion - part of drill" , "Mouthpiece of brindle or tip of drilling tool" .)

I've seen this clue in the Evening Standard.
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