Eleven parts of a relay race? (4)

I believe the answer is:

legs

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'eleven parts' is the definition.
'legs' can be an answer for 'parts' (leg is a kind of part). I'm not sure about the 'eleven' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for legs that I've seen before include "Sections of a journey or course" , "Lower limbs" , "Members" , "associated with 11 in game" , "Stages of a journey" .)

I've seen this clue in the Evening Standard.

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