The term CROSSWORDER'S CREEK is a combination of two crossword solutions: RIA (3 letters) and CREEK. RIA is an acronym for the Regional Investment Authority, which is a government body responsible for managing investments in a particular region. CREEK is a small stream of water that flows through a valley or other area. Together, CROSSWORDER'S CREEK could be interpreted as a metaphor for a person who is adept at solving crossword puzzles, as they are able to navigate the winding paths of the puzzle with ease.