Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Mischief-maker \Mis"chief-mak`er\, n. One who makes mischief; one who excites or instigates quarrels or enmity.
WordNet
n. someone who deliberately stirs up trouble [syn: troublemaker, trouble maker, troubler, bad hat]
Usage examples of "mischief-maker".
A power unit was seized, and after a bout of insane monkeying with the machinery, the mischief-makers inadvertently got things into such a state that at last the awful djin of physical energy was able to wrench off his fetters and rage over the planet.
Then, if the Milesian leaders grow too arrogant, you might find use for a mischief-maker who could ingratiate himself into court after court and foment dissension, setting the Milesians against one another, until only the Fair Folk could resolve their disputes and restore order again.