Crossword Genius

In which we serve starters (6)

Ross

I believe the answer is:

tennis

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This might be a double definition.

'in which we' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'serve starters' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?

Can you help me to learn more?

(Other definitions for tennis that I've seen before include "Evil trap set up for game" , "Roger Federer's game - anyone for it?" , "Popular racket game - anyone for it?" , "Sent in strangely to play the game" , "Sent in to play the game, oddly" .)

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