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]