noun (n)

• an interpretation that removes obstacles to understanding(noun.communication)

  Example:
  The professor's clarification helped her to understand the textbook.
  

  Synonym:
  elucidation, illumination
  

  source: wordnet30
• the act of removing solid particles from a liquid(noun.act)

  Synonym:
  clearing
  

  source: wordnet30
• The act or process of making clear or transparent, by freeing visible impurities; as, the clarification of wine.(noun)

  source: webster1913