Crossword Genius

The little that sank in (3)

Ross

I believe the answer is:

bit

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'the little' is the definition.
(a small bit)

I can't explain the remainder of the clue.

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(Other definitions for bit that I've seen before include "Small fragment" , "Binary digit; small piece" , "gripped" , "Small quantity or piece of metal for a horse" , "chip?" .)

I've seen this clue in the Evening Standard.
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