Crossword Genius

Unprincipled — playfully mischievous (7)

Ross

I believe the answer is:

roguish

(Other definitions for roguish that I've seen before include "Coy" , "I gush or change to be waggish" , "Saucy" , "Dishonest - mischievous" , "reprobate" .)

I've seen this clue in The Guardian.
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