Ask a lawyer and get answers to your legal questions
The employer should be held liable for the acts of the clinician if he/she is an employee of the company and was employed at the time of the incident. The clinician would be liable, and not the employer, if he/she is an independent contractor.
The employer could also escape liability if the clinician committed a criminal act.
Sorry if the answer wasn't longer, but I really don't believe there's much else to say. You asked about respondeat superior (employer's liability for the clinician) and then about finding a lawyer.
Unless you can afford to pay for an attorney, your options are very limited as many attorneys will not take cases on a contingency that appear to be a long shot, which is apparently what they perceive here.
All you can do is shop around and try to find a lawyer willing to help pro bono (free) or on a contingency.