The term clinical is pretty broad. Nevertheless, I would be cautious against using it without having an official clinical capacity with appropriate supervision. If you are talking about putting it into applications for grad school, then list it as volunteer work and describe what you did while you were there. It will mainly just show how you function in a clinical environment with other providers, no one expects you to be a clinician until you actually start training to be one and sometimes getting ahead of yourself in that would be a negative.