The term 'Mechanics Concern' can be broken down into two parts: Mechanics and Concern. Mechanics is a job that involves the maintenance and repair of machines and other mechanical equipment, while Concern is an issue or problem that needs to be addressed. The crossword solution for this term is ENGINE, which refers to the internal combustion ENGINE, a type of machine that powers many vehicles. An ENGINE mechanic is someone who specializes in the maintenance and repair of engines.