The phrase "a trainee for" is correct and usable in written English.
It can be used when referring to someone who is undergoing training for a specific role or position.
Example: "She is a trainee for the position of marketing assistant at the company."
Alternatives: "a trainee in" or "a trainee of".
Many corporate law firms operate carefully constructed month-long summer placements designed to replicate life as a trainee for participants.
Then she served as a trainee for judge and prosecutor since 2003 to 2005, and a prosecutor since 2005.
In a plea bargain he acknowledged that prosecutors had evidence to prove he had been a trainee for Al Qaeda who was prepared to fight Americans.
After Yu-Lung Yin was called to the bar, he served as a trainee for attorneys for half a year in 2002.
After that, he was a trainee for prosecutors and judges for two years, and has served as a prosecutor in the Kaohsiung District Prosecutors Office since 2004.
After working as a motorcycle courier, Mr. Ward was introduced to commodities in 1979, when he became a trainee for the tea, rice, cocoa and rubber operations at the conglomerate Sime Darby.
Mr. Schuessler, 49, joined Wendy's in 1974 as a manager trainee for a franchisee in Atlanta.
He recalled when one of Jack Kriendler's brothers yelled at him, as a young trainee, for making a martini and said the feds, during one raid, found booze that had not been dumped.
After leaving Fort William senior secondary at 15 he made an unsuccessful start as a police cadet, followed by an equally unsuccessful stint as a trainee reporter for the Press and Journal.
I was a trainee there for seven months.
In at least one instance, Munoz said, a trainee pushed for the campaign to be more active in challenging voters' qualifications.
