Upright couple forming a team (6)

I believe the answer is:

eleven

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

I don't understand the remainder of the clue.

(Other definitions for eleven that I've seen before include "Smallest positive three-syllable integer" , "Number, on a team perhaps" , "Age to start secondary education" , "Footballers" , "Odd number for a team" .)

I've seen this clue in the Evening Standard.

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