All the runners in the meadow (5)

I believe the answer is:

field

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'meadow' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for field that I've seen before include "Enclosed piece of land or area of endeavour" , "Area for crops/livestock" , "his nocturnes, perhaps?" , "Branch of study" , "Piece of farmland" .)

I've seen this clue in the Evening Standard.

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