The term 'ITEM IN A TRUNK' can be broken down into three crossword solutions: JACK (4 letters), SPARE (5 letters), and TIRE (4 letters). JACK is a common name, but it can also refer to a device used to lift heavy objects. A SPARE is an extra item that is kept in case the original item is lost or damaged. A TIRE is a circular piece of rubber that is attached to the wheel of a vehicle. All three items are commonly found in the trunk of a car.