The use of the title "Doctor" before one's name typically depends on the specific qualifications and professional regulations in the country or region where the individual practices. In many countries, including the United States, Canada, and many European countries, an MPhil (Master of Philosophy) in clinical psychology does not grant the individual the title of "Doctor."
To be addressed as "Doctor," a person usually needs to hold a doctoral degree, such as a Ph.D. (Doctor of Philosophy) in clinical psychology or a Psy.D. (Doctor of Psychology). These doctoral degrees require several years of advanced study and research beyond the master's level, and they are generally the minimum qualifications for individuals to be considered licensed psychologists in most regions.
It's essential to adhere to the ethical and professional guidelines governing the use of titles in the field of psychology. Claiming a title that one has not earned may lead to ethical and legal issues.
If someone with an MPhil in clinical psychology wishes to pursue the title of "Doctor," they would need to pursue further education and obtain a recognized doctoral degree in clinical psychology or a related field.