Fixer (Noun) — Someone who intervenes with authorities for a person in trouble (usually using underhand or illegal methods for a fee).
Fixer (Noun) — A chemical compound that sets or fixes something (as a dye or a photographic image).
Fixer (Noun) — A skilled worker who mends or repairs things.
Fixer (Noun) — Synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction.