Number of team members seen one after another (6)

I believe the answer is:

eleven

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'number' is the definition.
(eleven is a kind of whole number)

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

(Other definitions for eleven that I've seen before include "Football or cricket team?" , "Age to start secondary education" , "Number, on a team perhaps" , "Late" , "sports team?" .)

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