Crossword Genius

Sylvester is artful (3)

Ross

I believe the answer is:

sly

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

I don't understand the rest of the clue.

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(Other definitions for sly that I've seen before include "Doing things in unpleasant and secret way" , "Unpleasantly cunning and secretive" , "Wily, shifty" , "Cunning, deceitful" , "Cunning; surreptitious" .)

I've seen this clue in The Mirror.
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