A more thorough explanation:

A Calvo clause is a legal term used in contracts between a national government and an alien. It is a clause that waives the right of an alien to invoke diplomatic immunity. This means that the alien cannot claim immunity from the laws of the country they are in, even if they are a diplomat or a government official.

For example, if a foreign company signs a contract with the government of a country that includes a Calvo clause, the company cannot claim diplomatic immunity if they violate any laws of that country. This clause is often used to ensure that foreign companies and individuals are held accountable for their actions in the host country.

Another example is when a foreign diplomat signs a lease agreement for a property in a host country that includes a Calvo clause. If the diplomat violates any laws or regulations related to the property, they cannot claim diplomatic immunity and must face the consequences of their actions.

In summary, a Calvo clause is a contractual clause that waives the right of an alien to claim diplomatic immunity in a host country. It is often used to ensure accountability and compliance with local laws and regulations.