Crossword Genius

Winner dispatching ball casually: score, deuce (9)

Ross

I believe the answer is:

succeeder

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

'winner' is the definition.
(I know that winner can be written as succeeder)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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