Possible Clues:

• One of Clement Clarke Moore's reindeer
• One on the pull at Christmas — the Queen?
• When listed, usually the first of Santa Claus’s reindeer
• Rudolph's companion
• Cupid's companion, one in a hurry
• Comet companion
• One going quickly turning miserable, star losing love
• Person in a hurry
• Member of a sleigh-pulling team
• Opens 17 down in Germany, gets to finish order, and is quick out of the blocks