Hodgdon's Australian-made Clays has more or less similar reloading characteristics and burns very clean. You might also consider IMR's 700X, another old standard that is tried and true. Winchester's WST Super Target is a Ball process powder. It has fine grains and meters well, but none of the Ball process powders are known for being particularly clean burning. I really wouldn't worry about it.
Clean burn is a much over rated attribute.
I shoot a gas gun and noted absolutely no functional difference between Red Dot and Clays. None at all. I'm not the world's most conscientious cleaner either. The reason that the fast powders like Red Dot and 700X have been so popular is that they are very economical. You quite often use less grains of powder to achieve a given velocity with your selected components.