I'm not a hog farmer, but a teensy bit of research suggests you're going to have malnourished pigs which may not even survive. They need more protein, a source of fresh water, and bulk ordinarily provided by grains.
From Encyclopdia Britannica: "Pigs have the same basic nutritional requirements as humans, which include water, various vitamins and minerals, protein for growth and repair, carbohydrates for energy, and fat to supply essential fatty acids that are not synthesized in adequate quantities. Water is often a forgotten nutrient because it is usually readily available. As a guide, pigs need two to three times as much water as dry feed, depending on environmental temperatures."
I don't know what all's in clover, but I doubt there's much protein and carbs, or any fat.
Maryn, who in fact does indeed eat like a pig