The Collaborative International Dictionary of English v.0.48:

Clerisy \Cler"i*sy\, n. [LL. clericia. See Clergy.]
   1. The literati, or well educated class.
      [1913 Webster]

   2. The clergy, or their opinions, as opposed to the laity.
      [1913 Webster]

WordNet (r) 3.0 (2006):

clerisy
    n 1: an educated and intellectual elite [syn: intelligentsia,
         clerisy]