The term 'Yard Filler' is a job description for someone who is responsible for filling yards with materials such as soil, gravel, and mulch. The crossword solution ALE is an abbreviation for the word 'ALLOTMENT, ' which is another term for a piece of land that is used for gardening or farming. Therefore, the term 'Yard Filler' could refer to someone who is responsible for filling yards with soil, gravel, and mulch in order to create allotments for gardening or farming.