The term SHIFTING AID can be summarized as a device used to facilitate the changing of gears in a vehicle. The crossword solution for this term is CLUTCH, which is a mechanical device that engages and disengages power transmission especially from a motor to a driven part. It is typically operated by a foot pedal or lever and is used to control the torque delivered by the engine. The CLUTCH is an essential component of any manual transmission vehicle, allowing the driver to smoothly transition between gears.