The term 'West Coast NFLer' refers to a professional American football player who plays for a team located on the West Coast of the United States. The crossword solution for this term is 'NINER, ' which is a reference to the San Francisco 49ers, a professional American football team based in the San Francisco Bay Area. The 49ers are one of the most successful teams in the National Football League (NFL), having won five Super Bowl championships and appearing in a total of seven.