suborner

from WordNet (r) 3.0 (2006)

suborner
    n 1: someone who pays (or otherwise incites) you to commit a
         wrongful act [syn: {briber}, {suborner}]

from The Collaborative International Dictionary of English v.0.48

Suborner \Sub*orn"er\, n.
   One who suborns or procures another to take, a false oath;
   one who procures another to do a bad action.
   [1913 Webster]