Final answer:
Hoarseness is considered an early clinical indicator of cancer of the larynx.
Step-by-step explanation:
The early clinical indicator that is considered an early sign of cancer of the larynx is hoarseness. Hoarseness is a change in the voice that can occur due to changes in the larynx caused by a tumor. Other common symptoms of laryngeal cancer include difficulty swallowing, persistent cough, and weight loss. However, hoarseness is often one of the earliest signs of laryngeal cancer.