The Collaborative International Dictionary of English v.0.48:

Clerical \Cler"ic*al\, a. [LL. clericalis. See Clerk.]
   1. Of or pertaining to the clergy; suitable for the clergy.
      "A clerical education." --Burke.
      [1913 Webster]

   2. Of or relating to a clerk or copyist, or to writing.
      "Clerical work." --E. Everett.
      [1913 Webster]

   3. characteristic of the work performed by a clerk,
      secretary, or copyist, or suitable to be performed by a
      clerk. "Clerical staff."
      [PJC]

   A clerical error, an error made in copying or writing.
      [1913 Webster]