Final answer:
The requirement for an applicant to have a clean criminal record is indicative of their good moral character.
Step-by-step explanation:
The requirement that indicates an applicant for naturalization should have a clean criminal record is having a good moral character. This means that the applicant should not have been involved in serious criminal activities or have a history of immoral behavior. Having a clean criminal record demonstrates that the individual has respected the laws of the country and is likely to continue doing so as a citizen.
Learn more about Naturalization requirement: clean criminal record