Final answer:
When a client says 'clear' during defibrillation, an appropriate action is to step back and ensure no one is touching the client.
Step-by-step explanation:
When a client says 'clear' during defibrillation, an appropriate action is to step back and ensure no one is touching the client. This is important because defibrillators deliver a large shock of electrical energy to terminate irregular heart rhythms. By stepping back and making sure no one is touching the client, it helps prevent anyone from getting shocked or injured.