The scope of practice for all registered social workers is defined in schedule 27 of the Health Professions Act. Registered clinical social workers are considered to have expertise in practicing clinical social work and using the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5).
Unless the registered clinical social worker has received authorization to perform restricted psychosocial interventions, they may not practice in this very specific area of practice. See details here.
All social workers are required to limit their practice to areas of competence that can be demonstrated by knowledge, skills and abilities. Ongoing competency requirements are here.