The Collaborative International Dictionary of English v.0.48:

Ensnare \En*snare"\, v. t.
   To catch in a snare. See Insnare.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ensnare
    v 1: take or catch as if in a snare or trap; "I was set up!";
         "The innocent man was framed by the police" [syn:
         ensnare, entrap, frame, set up]
    2: catch in or as if in a trap; "The men trap foxes" [syn:
       trap, entrap, snare, ensnare, trammel]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "ensnare":
   allure, bag, bait, bait the hook, birdlime, blandish, cajole,
   capture, catch, catch out, catch up, coax, decoy, draw, draw in,
   draw on, enmesh, ensnarl, entangle, entice, entoil, entrap, enweb,
   flirt, flirt with, foul, gin, give the come-on, harpoon, hook,
   hook in, inveigle, land, lasso, lead on, lime, lure, mesh, nail,
   net, noose, offer bait to, rope, rope in, sack, seduce, snag,
   snare, snarl, sniggle, spear, spread the toils, suck in, take,
   tangle, tangle up with, trap, trip, wind, woo