How does a kiwi power a clock?

A kiwi, specifically the kiwi bird, does not power a clock. However, if you're referring to a "kiwi" in the context of a kiwi fruit or a technological term, there is no direct connection either. Clocks typically operate using batteries, mechanical movements, or other energy sources like quartz crystals. If you meant a specific device or concept involving "kiwi," please provide more details for clarification.