Crossword Genius

Unscrupulous tennis player? (9)

Ross

I believe the answer is:

racketeer

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'tennis player?' is the definition.
(I know that tennis player can be written as racketeer)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for racketeer that I've seen before include "tennis player?" , "fraudster" , "Crook" , "Wide boy" , "Mafia-type" .)

I've seen this clue in The Irish News.
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