Customhouse broker

from The Collaborative International Dictionary of English v.0.48

Customhouse \Cus"tom*house"\ (-hous`), n.
   The building where customs and duties are paid, and where
   vessels are entered or cleared.
   [1913 Webster]

   {Customhouse broker}, an agent who acts for merchants in the
      business of entering and clearing goods and vessels.
      [1913 Webster]