Answer:

SINGLEFILE

AnswerCrossword Clue
SINGLEFILEHow students often line up
SINGLEFILEQueue
SINGLEFILELineup instruction, perhaps
SINGLEFILEUsual line formation
SINGLEFILEOne at a time, in line
SINGLEFILELike some waiting lines
SINGLEFILEOne-person-wide line
SINGLEFILEOne after another
SINGLEFILEArranged one behind the other
SINGLEFILEQueue order.
SINGLEFILEOne at a time.
SINGLEFILEMarching formation
SINGLEFILEIn a line
SINGLEFILEGrade school marching orders
SINGLEFILEOne-by-one formation, as in walking
SINGLEFILEOne behind the other