If your soil isn't horrible, I'd just sheetmulch the clover with
cardboard and lay mulch on top of that. Go easy on the compost.....sweet potatoes don't like an excess of nitrogen. Let the area settle for a while and then punch holes through and plant slips or tubers and watch it grow. Unless you're in the mountains you can probably plant up through June and still make a crop. And another hint.....eat the greens! A lot of folks don't know that. They make an excellent substitute for spinach lightly cooked. If space is limited pruning the vine tips for greens achieves two purposes, and you can take up to 20% of the foliage on a big sweet potato plant without damaging the
root yield. But beware of
deer. They know those greens are good to eat too!