A team of two, as the Romans would have figured? (6)

I believe the answer is:

eleven

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'a team' is the definition.
(I know that eleven is a type of team)

I can't explain the remainder of the clue.

(Other definitions for eleven that I've seen before include "Number, on a team perhaps" , "Number killed in the Peterloo massacre" , "Players" , "Prime number" , "Cardinal" .)

I've seen this clue in the Evening Standard.

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