Crossword Genius

Spymaster has the leading role in roguery (8)

Ross

I believe the answer is:

mischief

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'roguery' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for mischief that I've seen before include "Wrongdoing, devilment" , "nuisance" , "injury" , "bad behaviour" , "Naughtiness, trouble" .)

I've seen this clue in The Times.
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