Yes, fixer is a Scrabble word!

Noun

1. Someone who intervenes with authorities for a person in trouble (usually using underhand or illegal methods for a fee)

2. A chemical compound that sets or fixes something (as a dye or a photographic image)

3. A skilled worker who mends or repairs things

4. Synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction