Crossword Clue:

A period when this is in force

AnswerCrossword Clue
ENGLISHTEXTBOOKIn this, a "." is a "period"
BLOOMA flower is pretty when it's in this
SCENEIWhen, in Act II, Macbeth soliloquizes, "Is this a dagger ..."
ANOEnero is first in this period
UPTIMEPeriod when a computer is functioning
MERRYMONTHOFMAYSYearly period when a baseballer is gleeful?
CRUNCHPeriod of time when a deadline is near