Crossword Genius

In court a substitute for nothing (4)

Ross

I believe the answer is:

love

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'nothing' is the definition.
(love means zero in tennis)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for love that I've seen before include "like very much?" , "powerful emotion" , "Nothing for the Williams sisters?" , "No score, sweetheart" , "See 10" .)

I've seen this clue in The Irish Independent.
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