The answer to the crossword for the term 'For a farm machine?' is 'protractor' (10 letters). A protractor is a tool used to measure angles. It is typically made of transparent plastic or metal and has two sets of numbers around the edge, one set measuring degrees and the other measuring radians. Protractors are commonly used in mathematics, engineering, and carpentry. They are also used in farming to measure the angle of a plow or other farm machinery.