__ to the core (wicked) (6)

I believe the answer is:

rotten

(Other definitions for rotten that I've seen before include "'Decayed, stinking (6)'" , "Decayed - to the core" , "Lousy" , "Decayed or despicable" , "Something is ... in the state of Denmark (Hamlet)" .)

I've seen this clue in the Newsday.

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