Crossword Genius

Tennis champion's good service (4)

Ross

I believe the answer is:

real

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

I believe this clue is a quadruple definition!!

'tennis' is the first definition.
(real tennis is a kind of tennis)

'champion's' is the second definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'good' is the third definition.
(thesaurus)

'service' is the fourth definition.
(I know that real is a currency)

Can you help me to learn more?

(Other definitions for real that I've seen before include "Genuine or existing" , "Actual, concrete" , "Pukka" , "Actual; Brazilian currency" , "foreign currency" .)

I've seen this clue in The Telegraph.
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