a dental 'assistant' [=a person whose job is to help a dentist]
She works as a 'sales assistant' [='salesclerk'] at Macy's.
a wealthy executive who has a personal 'assistant'
(..) Gus was trying to kill both of us, and now he pulls you out of the lab and employs you as... what, an assistant gunman? A tough guy? Does that make any sense to you? He says he sees something in you. (..)2011 TvShow: Breaking Bad Title: Problem Dog Season: 4 Episode 7