watchmaker; clockmaker
Rare term for a person who makes or repairs watches and clocks. The more common word is 時計屋 (とけいや).
See also: 時計屋
時計工 is a rare word for a watchmaker; normally people say 時計屋.
Compound of 時計 (clock/watch) and 工 (craftsman/worker). The exact origin is uncertain; it is a rare synonym for 時計屋.