When I read this question, I interpret it as you asking if clinical counselors can be a therapist or if instead of working with people, they work in a lab, doing research or medical testing. Is that right? I found this article to help you out. But to simplify it, any licensed psychologists can work as a therapist. You may find an area you want to focus on, like working with children, as time goes on. It's not uncommon for people to try different things over their career.
I am more familiar with social work, which is another type of counseling degree. In Texas, we have Licensed Clinical Social Workers, who provide therapy and can diagnose mental problems.
"Clinical psychologists have traditionally studied disturbances in mental health, while counseling psychologists’ earliest role was to provide vocational guidance and advice.Today, though, the differences between psychologists from each specialty are more nuanced, and there are perhaps more similarities than differences among individual psychologists from each field."