The Collaborative International Dictionary of English v.0.48:

Ensconce \En*sconce"\, v. t. [imp. & p. p. Ensconced; imp. &
   p. p. Ensconcing.]
   To cover or shelter, as with a sconce or fort; to place or
   hide securely; to conceal.
   [1913 Webster]

         She shall not see me: I will ensconce me behind the
         arras.                                   --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ensconce
    v 1: fix firmly; "He ensconced himself in the chair" [syn:
         ensconce, settle]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "ensconce":
   anchor, becloud, befog, billet at, bivouac, blanket, blind, burrow,
   bury, cache, camouflage, camp, cloak, cloud, colonize,
   come to anchor, conceal, cover, cover up, curtain, disguise,
   dissemble, distract attention from, ditch, domesticate,
   drop anchor, eclipse, enshroud, envelop, establish,
   establish residence, fix, gloss over, hide, hive, inhabit, install,
   keep house, keep under cover, live at, locate, mask, moor, move,
   nest, obfuscate, obscure, occult, park, people, perch, place,
   plant, populate, relocate, reside, roost, screen, seat, secrete,
   set, set up housekeeping, set up shop, settle, settle down, shade,
   shroud, sit down, situate, slur over, squat, stand, stash, station,
   stay at, strike root, take residence at, take root,
   take up residence, varnish, veil, whitewash