Crossword Genius

Runners in paddock (5)

Ross

I believe the answer is:

field

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'runners in' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'paddock' is the second definition.
(I know that paddock can be written as field)

Can you help me to learn more?

(Other definitions for field that I've seen before include "Crop land; catch (ball)" , "Area of grass" , "Line of business - enclosed farm area" , "Area of interest" , "Piece of grassland" .)

I've seen this clue in The Sun.
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