Doc seen for sinusitis

ENT

This medical specialist might examine your throat or perform a hearing test, often found in hospitals or private clinics.

The clue plays on the double meaning of "Doc." Here, it refers to a doctor, specifically an ear, nose, and throat specialist (ENT), who treats sinusitis. The wordplay is simple—"Doc" is a casual term for a doctor, and "ENT" is the abbreviation for that medical specialty. The clue cleverly hints at the answer by combining the informal title with the condition they’d handle.