This is the 10066th most frequent Japanese word.
速い
Fast.
In this sentence, '速い' is used metaphorically to imply that the clock is ahead of the correct time, indicating it runs faster than it should.
時計が速い。
The clock is fast.
Here, '速い' refers to the speed of the action of running, describing it as occurring quickly or rapidly.
彼の走りは速い。
His running is fast.
In this context, '速い' is used to describe the speed capability of the car, indicating its ability to move swiftly.