noun Agent noun of fix: one who, or that which, fixes.
noun A chemical (sodium thiosulfate) used in photographic development that fixes the image in place, preventing further chemical reactions.
noun A person who serves as an agent to arrange for a desired result, perhaps by improper and/or unlawful means.
noun Someone who is often paid that helps a customer cut through red tape, especially for government processes or applications.
noun A person who arranges immunity for defendants by tampering with the justice system via bribery or extortion, especially as a business endeavor for profit.
noun A person who assists foreign journalists in volatile countries, often providing interpretation, personal connections, and transportation services.