Atype of therapy in which clients meet regularly in a group setting and discuss problems under the guidance of a single therapist is called therapy.

The answer is group therapy.

Explanation:

Group therapy is considered a form of psychotherapy in which there is one or some therapists who must treat a group of clients which are usually considered as a group. The term can be usually utilized in forms of psychotherapy when we are talking about group formats. For example, Art therapy or interpersonal therapy.

However, the term is mainly used in psychodynamic group therapy because the context and the process in these groups refer to a mechanism of change that can be developed through the different relationships between people within the group.  

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