Find the word definition

Douglas Harper's Etymology Dictionary
clock-watcher

"employee habitually prompt in leaving," 1887, from clock (n.1) + agent noun from watch (v.). Related: Clock-watching. Compare earlier tell-clock "idler" (c.1600).

Wiktionary
clock-watcher

alt. A person who is eager for time to pass (e.g., at work or school), especially when faced with an undesirable task. n. A person who is eager for time to pass (e.g., at work or school), especially when faced with an undesirable task.