The term 'FARMER's Harvest' refers to the crops that a FARMER harvests from their land. The four-letter answer to this crossword is 'CROP'. A CROP is a plant or plant product that is grown and harvested for food, fuel, or other commercial use. Farmers typically grow a variety of crops, such as grains, vegetables, fruits, and nuts, depending on the climate and soil conditions in their region. The harvest of these crops is an important part of the farming process, as it provides the FARMER with a source of income and sustenance.