The term 'Christmas Stealer' can be summed up by the 6-letter crossword solution 'Grinch'. The Grinch is a fictional character created by Dr. Seuss in his 1957 children's book 'How the Grinch Stole Christmas!'. The Grinch is a green, furry creature who lives in a cave on a mountain overlooking the town of Whoville. He despises Christmas and attempts to steal it from the Whos, but eventually learns the true meaning of Christmas and returns all the presents he had stolen.