Final answer:
The most indicative clinical sign of a scaphoid fracture is tenderness in the anatomical snuffbox.
Step-by-step explanation:
The most indicative clinical sign of a scaphoid fracture is tenderness in the anatomical snuffbox. The anatomical snuffbox is a shallow depression on the radial side of the wrist, located between the extensor pollicis longus and extensor pollicis brevis tendons. Palpation of this area can elicit pain in patients with a scaphoid fracture.