Crossword Genius

More mischievous (9)

Ross

I believe the answer is:

naughtier

'more mischievous' is the definition.
('naughty' can be a synonym of 'mischievous')

This is all the clue.

(Other definitions for naughtier that I've seen before include "More badly behaved" , "Less well behaved" , "More mischievous" , "more unruly" , "Worse" .)

I've seen this clue in The Telegraph, the Irish Times (Simplex) and the Sydney Morning Herald.
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