'instigant' definitions:

Definition of 'instigant'

From: WordNet
noun
Someone who deliberately foments trouble; "she was the instigator of their quarrel" [syn: instigator, provoker, inciter, instigant, firebrand]

Definition of 'instigant'

From: GCIDE
  • instigant \instigant\ n. one who instigates; someone who deliberately provokes trouble; an instigator.
  • Syn: instigator, provoker, inciter. [WordNet 1.5]