Answer:

time

Answer	Crossword Clue
TIME	Denominator in the velocity formula
TIME	It's irreversible
TIME	Proctor's call

TIME	Proctor's declaration
TIME	What clocks keep
TIME	Something you might need to kill
TIME	What inmates do until they're released
TIME	Show of hands?
TIME	Marathoner's focus
TIME	Use a stopwatch on
TIME	You may find it on your hands or side

TIME	Cons do it
TIME	See 32-Across
TIME	See 27-Across
TIME	Magazine whose cover has a red border
TIME	... 100 (annual list)
TIME	It's often shown with hands
TIME	A metronome keeps it
TIME	What cons do

TIME	It can be bought without money
TIME	Use a stop clock on
TIME	The so-called fourth dimension
TIME	It may be on your side
TIME	Player's call
TIME	Red-bordered magazine
TIME	Cry after the sound of a bell
TIME	Game-stopping call

TIME	What prisoners do
TIME	Call to a basketball referee
TIME	Proctor's announcement
TIME	Test proctor's call
TIME	See 62-Down
TIME	Ump's call
TIME	Prisoners do it
TIME	Use a stopwatch

TIME	Test proctor's declaration
TIME	Newsweek rival
TIME	Marathoner's stat
TIME	Ref's call
TIME	Word with make or mark