The crossword solution for the term 'sole provider' is 'Dover', a five-letter word. Dover is a port city in Kent, England, located on the English Channel. It is the closest port to mainland Europe and has been a major port of entry for goods and people since the Iron Age. Dover is also known as the 'Gateway to England' and is the busiest ferry port in the world. The port is a major provider of jobs and economic activity in the region.