The crossword solutions for the term 'Christmas Poem Opener' are 'Twas', 'ERE', 'HARK', and 'Its'. This phrase is the opening line of the classic poem 'A Visit from St. Nicholas' by Clement Clarke Moore, which is also known as 'The Night Before Christmas'. The full opening line is 'Twas the night before Christmas, when all through the house, not a creature was stirring, not even a mouse. ERE the children were nestled all snug in their beds, HARK! The herald angels sing, 'Glory to the newborn King!' Its little eyes, how they twinkled! Its dimples, how merry!'