Smartweed is the plant from hell. I have a section of it on a low spot in one plot that I've sprayed with heavy doses of Gly. The first spraying set it back a bit. The second spraying three weeks later killed about three quarters of it, but it's coming back. I don't see how anything that kills that miserable stuff won't also kill any clover in the area.
I have never used it on smartweed but it is on the label to control smartweed. Might take several sprayings. Like stated it is one tough plant that is a very heavy seed producer.