the.com/fixer

means A person skilled at solving other people's messy problems quickly and discreetly, often by working around normal rules or channels.

from Straightforward agent-noun from 'fix' (to repair, to arrange, to make firm) plus '-er.' 'Fix' traces back through Middle English to Latin 'fixus,' past participle of 'figere' — to fasten or drive in, like a nail. The sense of 'fix' meaning 'to arrange a result improperly' (fix a race, fix a jury) emerged in the 1800s, and it's this shadier branch of the word that gave 'fixer' its underworld-adjacent flavor by the early 20th century — first in criminal and political slang for someone who arranges outcomes behind the scenes, later borrowed by Hollywood and corporate PR for the same skill, legalized.