The Collaborative International Dictionary of English v.0.48:

Broacher \Broach"er\, n.
   1. A spit; a broach.
      [1913 Webster]

            On five sharp broachers ranked, the roast they
            turned.                               --Dryden.
      [1913 Webster]

   2. One who broaches, opens, or utters; a first publisher or
      promoter.
      [1913 Webster]

            Some such broacher of heresy.         --Atterbury.
      [1913 Webster]