Yules is a term used to refer to the Christmas season. It is derived from the old English word 'YULE' which was used to describe the 12-day festival of midwinter. The phrase 'Seasons to be Merry' is often used to express joy and happiness during the holiday season. Therefore, Yules is an appropriate solution for the crossword clue as it is a term used to refer to the Christmas season, which is a time of joy and celebration.