Answer:

TIME

AnswerCrossword Clue
TIMEIt's served in prison
TIMEWhat you may find on your hands
TIMEFive to two or ten to one
TIMEClock
TIMEHenry Luce's magazine
TIME... Warner
TIMEUmp's call
TIMEThing said to fly or march on
TIMEIt's money, it's said
TIMELife partner?
TIMEWound healer
TIMEFATHER ..
TIMEThe fourth dimension
TIMENews magazine
TIMEIt may be kept in halves
TIMELuce magazine
TIMECall from an ump
TIMEMarathoner's stat
TIMEOccasion
TIME"Person of the Year" magazine
TIMEDuration
TIME"What we want most, but what, alas! we use worst": William Penn
TIMEProctor's yell
TIME"A Brief History of ..." (1988 best seller)
TIME"A great teacher, but unfortunately it kills all its pupils": Berlioz
TIMEWhat a clepsydra measured
TIMEWord with limit or zone
TIMECons do it
TIMEJailbirds do it
TIMEIt marches on
TIME"Procrastination is the thief of ..": Young
TIMEConstant marcher
TIMEEntertainment giant .. Warner
TIMEKind of exposure or frame
TIMEIt marches and flies
TIMERace statistic
TIMEGiven moment, which can begin both parts of the answers to starred clues
TIMEHour
TIMERef's call
TIMEClock readout