Sportsman left out for love in his own field (4)

I believe the answer is:

nada

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'sportsman left out for love in his own field' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for nada that I've seen before include "Nothing (US)" , "Love" , "zip" , "Not a sausage" .)

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