The Collaborative International Dictionary of English v.0.48:

clitter \clitter\ v. i.
   to make a shrill creaking noise by rubbing together special
   bodily structures, as of male insects such as crickets or
   grasshoppers.

   Syn: stridulate.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

clitter
    v 1: make a shrill creaking noise by rubbing together special
         bodily structures; "male insects such as crickets or
         grasshoppers stridulate" [syn: stridulate, clitter]