Why is it called a clutch oven?

A clutch oven is not a common term and doesn't appear to be a widely recognized type of oven. The term "clutch" is typically associated with mechanical devices, such as in a car's transmission or a motorcycle's engine. Without further context or information about the specific usage of the term in the context of an oven, it's difficult to provide an accurate explanation for why it would be called a clutch oven.