D defs.my
Entry 2 senses Webster, 1913

Clearer

/klĭr'-ẽr/ · Clear·er · IPA /ˈklɪɹɚ/
01 n. One who, or that which, clears.
  1. 1.
    One who, or that which, clears.
    “Gold is a wonderful clearer of the understanding.” Addison.
  2. 2.
    A tool of which the hemp for lines and twines, used by sailmakers, is finished.(Naut.)