The phrase "leading producer" means that a person, company, or organization is one of the best or most successful at making or manufacturing something. They are ahead of others in terms of quality, quantity, or market share. Full definition
Today, our nation is the world's leading producer of oil and natural gas. (energytomorrow.org)
Excellent and immediate opportunities available for two skilled Maintenance Engineers to join a world leading producer of cereal products. (cv-library.co.uk)
This campaign also led the producers of green beans to negotiate new prices and other working conditions with their partners. (religion-online.org)