Crossword Genius

- plus one?


I believe the answer is:


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'plus one?' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is the entire clue.

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(Other definitions for twelve that I've seen before include "disciples" , "Midday" , "Basis of duodecimal system" , "Number of centuries needed for MCC" , "Number of Apostles" .)

I've seen this clue in the Evening Standard.
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