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Rascally as Jack? (7)

Ross

I believe the answer is:

knavish

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'rascally' is the definition.
(thesaurus)

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(Other definitions for knavish that I've seen before include "Villainous" , "Rascally" , "Dishonest, unscrupulous" , "Wily" , "Like unscrupulous man" .)

I've seen this clue in the Evening Standard.
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