Crossword Genius

Finish with some skill (4)

Ross

I believe the answer is:

kill

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'finish' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for kill that I've seen before include "Deprive of life" , "Prey" , "Cause to die" , "Do away with" , "Put an end to" .)

I've seen this clue in the Evening Standard.
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