Crossword Genius

In which play starts with love (6)

Ross

I believe the answer is:

tennis

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This clue might be a double definition.

'in which play starts' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'love' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'with' acts as a link.

Can you help me to learn more?

(Other definitions for tennis that I've seen before include "Racquet sport" , "Sport on a court" , "court contest" , "Sent in to play the game, oddly" , "Pete Sampras's sport" .)

I've seen this clue in The Irish News.
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