The term 'Monkey Holder' is a job title for someone who works with a BARREL. This person is responsible for holding the BARREL in place while it is being filled or emptied. They may also be responsible for ensuring that the BARREL is securely fastened to a vehicle or other structure. The crossword solution for this term is 'BARREL', which is a large cylindrical container typically made of wood or metal, used for storing or transporting liquids or other materials.