The Collaborative International Dictionary of English v.0.48:

finagle \finagle\ v. i. & t.
   to achieve something by means of trickery or devious methods.

   Syn: wangle, manage.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

finagle
    v 1: achieve something by means of trickery or devious methods
         [syn: wangle, finagle, manage]