A bit vulgar perhaps? (8)

I believe the answer is:

fraction

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'a bit' is the definition.
(I have seen 'little bit' mean 'fraction' so perhaps 'bit' could also mean 'fraction')

I can't explain the rest of the clue.

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(Other definitions for fraction that I've seen before include "A division of a whole number" , "Small proportion" , "Eg, an eighth" , "Inca fort (anag)" , "Part of an integer" .)

I've seen this clue in The Globe and Mail.

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