Work against the clock
We'll have to work against the clock to finish our presentation in time for the convention, but I think we'll be able to get it done.
Run out the clock
Facing a tie, he decided to run out the clock in the final moments.
Be watching the clock
Quit watching the clock and pay attention, John. We still have a lot of material to cover before class ends.
What time did you clock in this morning?
Doctors have been working on him around the clock, but his condition is still critical.