The Collaborative International Dictionary of English v.0.48:

Fancier \Fan"ci*er\, n.
   1. One who is governed by fancy. "Not reasoners, but
      fanciers." --Macaulay.
      [1913 Webster]

   2. One who fancies or has a special liking for, or interest
      in, a particular object or class or objects; hence, one
      who breeds and keeps for sale birds and animals; as, bird
      fancier, dog fancier, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fancier
    n 1: a person having a strong liking for something [syn:
         fancier, enthusiast]