The Collaborative International Dictionary of English v.0.48:

Clarify \Clar"i*fy\, v. t. [imp. & p. p. Clarified; p. pr. &
   vb. n. Clarifying.] [F. clarifier, from L. clarificare;
   clarus clear + facere to make. See Clear, and Fact.]
   1. To make clear or bright by freeing from feculent matter;
      to defecate; to fine; -- said of liquids, as wine or
      sirup. "Boiled and clarified." --Ure.
      [1913 Webster]

   2. To make clear; to free from obscurities; to brighten or
      illuminate.
      [1913 Webster]

            To clarify his reason, and to rectify his will.
                                                  --South.
      [1913 Webster]

   3. To glorify. [Obs.]
      [1913 Webster]

            Fadir, clarifie thi name.             --Wyclif (John
                                                  ii. 28).
      [1913 Webster]

WordNet (r) 3.0 (2006):

clarifying
    adj 1: that makes clear; "a clarifying example" [syn:
           clarifying, elucidative]