How old is the clover in the field? I've had that in one of my clover fields, we always called it wire grass. Clethodim wont kill it.Gly will kill it. If your clover is over a year old you could spray with a lighter dose of gly and it shouldn't kill your clover. It might brown it up a little, but it will bounce back. A lot of people use 1.25 qts of gly to an acre to kill grasses and weeds in clover without killing it, but it must be used in an established clover plot, not one you planted this past fall. They do this because gly is readily available and cheaper than clethodim and 24db.