You have data on the SSD, and want to clone the HDD to SSD? That'll remove whatever is on the SSD.
A clean install would be recommended opposed to a clone, and either way (clone or clean install), you'll be losing/reinstalling whatever is on the SSD, so back it up.
There's no way just to move your OS. You either clone the drive (cloning everything, warts 'n' all), or you clean install and start from there.