Those playing a match in two legs? (6)

I believe the answer is:

eleven

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'legs?' is the definition.
(eleven is 'legs eleven' in the game bingo)

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

Can you help me to learn more?

(Other definitions for eleven that I've seen before include "Number, on a team perhaps" , "one by one?" , "Lowest two-digit prime" , "XI as Roman numeral" , "Football or cricket team?" .)

I've seen this clue in the Evening Standard.

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