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Professional players finally slaughtered (7)

Ross

I believe the answer is:

skilled

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'professional' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

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(Other definitions for skilled that I've seen before include "Adept, clever" , "Competent - experienced" , "Talented" , "Expert, adroit" , "Showing great aptitude" .)

I've seen this clue in The Telegraph.
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