fixer

noun

1. 1.Agent noun of fix; one who, or that which, fixes.
2. 2.A chemical (sodium thiosulfate) used in photographic development that fixes the image in place, preventing further chemical reactions.
3. 3.(criminal justice) A person who arranges immunity for defendants by tampering with the justice system via bribery or extortion, especially as a business endeavor for profit.
4. 4.A person who assists foreign journalists in volatile countries, often providing interpretation, personal connections, and transportation services.
5. 5.A fixer-upper.