An underdog victory is a term used to describe when an underdog team or individual unexpectedly wins a competition. It is often seen as a surprise and can be a great source of inspiration for those who have been told they are not good enough. In this crossword, the solution to the clue 'UPSET' (5 letters) is 'BEAT'. This implies that the underdog has beaten the favorite in the competition, resulting in an underdog victory.