How tall are the broadleafs? If they've already went to seed, you'll be waisting your time spraying them. Herbicide kills the plant, not the seeds that have developed on the plants, when mature. If you spray, the seeds will just resprout. Better to mow, then wait a few weeks and then spray. Keep the mower high, about 6", at least, so your really just cutting the tops off the weeds and grasses. If your clover is browned up and stressed, i'd stay off of it for now, until the temps drop and rain is more frequent. Spring is the time to attack weeds and grasses.