British & Australian a business or product that makes a lot of money for someone.
Cookery books are becoming a real money-spinner for the publishing industry.
money-spinner
noun anything that makes easy profits UK, 1952
money-spinner
A lucrative business or product. Primarily heard in UK, Australia. That mobile dating app has proved to be a real money-spinner for the developer—it's making them more money than anything else they've launched before.