clarifier

Noun

 * 1) One who, or that which, clarifies.
 * 2)  A speech act intended to clarify or correct one's own prior utterance.
 * 3) A vessel in which the process of clarification is conducted.
 * 4)  An additional card used to enhance or explain the primary cards in a spread.
 * 1)  An additional card used to enhance or explain the primary cards in a spread.

Etymology
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Verb

 * 1) to clarify