A clockmaker is an artisan who makes and repairs clocks. A contemporary, well-trained clockmaker is more likely to be able to repair a clock than to actually build or manufacture a clock from scratch. Clockmakers can typically manufacture many of the parts found in a clock.
A clockmaker, as the name implies, works primarily on clocks, not watches. Some clockmakers work on watches, but the skills and tools needed to work on a clock are not always applicable when working on a watch.
Due to the technical skills required for making and repairing clocks, clockmakers occasionally delve into other areas with similar aspects, ranging from items that involve gears, to minor metalworking, to something else completely different. In a very famous example, the harmonica was invented by a young German clockmaker, which was then mass produced by another clockmaker, Matthias Hohner.