Mardis Gras Follower is a term used to describe someone who participates in the traditional celebration of Mardis Gras. The celebration is typically associated with the Christian season of LENT, which is a period of fasting and penitence that lasts for 40 days before Easter Sunday. The term 'LENT' is an appropriate four-letter solution for this crossword clue, as it is the season during which Mardis Gras is celebrated.