You can still give the transplanted clematis the transplant fertilizer every couple of weeks till it freezes. I'm in the same zone as you and have successfully transplanted established clematis before. Make sure it stays moist but not wet and put some mulch around the plant but not on the crown for the winter. Next spring it should come back. What class of pruning is it? I'm not familiar with that variety. In any case I would prune it to half it's height and and half the number of stems in the spring. Pruning it now may force it into new growth. I'm no expert but that's how I did it and it worked for me. The following year my clematis didn't grow much and didn't flower much but the next year it took off like nothing had ever happened to it. Good Luck!
