The ones that figure? (6)

I believe the answer is:

eleven

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'figure?' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand how the remainder of the clue works.

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(Other definitions for eleven that I've seen before include "Bingo's "legs"?" , "Lowest two-digit prime" , "Late" , "Number killed in the Peterloo massacre" , "Number, on a team perhaps" .)

I've seen this clue in the Evening Standard.

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