Source : Webster's Revised Unabridged Dictionary (1913)

Mischief-maker \Mis"chief-mak`er\, n.
   One who makes mischief; one who excites or instigates
   quarrels or enmity.

Source : WordNet®

mischief-maker
     n : someone who deliberately stirs up trouble [syn: {troublemaker},
          {trouble maker}, {troubler}, {bad hat}]