Answer: Since you have leaves with attached roots, you should be able to pot your plant reminant up and it should grow. You might also try to salvage the rest of the roots (unless you've already tossed them). Use regular potting soil and set the short roots in the soil and the leaves above the soil line. Prop it up if you need to (bamboo skewers or popsicle sticks). Water the soil well after planting your clivia and then allow the soil to dry out on top before watering again. If you keep the roots in water they might suffocate (they need oxygen!) so pot your plant up asap.
Best wishes with your clivia!
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