Crossword Genius

They provide protection - for tennis players? (10)

Ross

I believe the answer is:

racketeers

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

'players?' is the definition.
The definition and answer can be both people as well as being plural nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

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I've seen this clue in The Independent.
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