Answer: divider

AnswerCrossword Clue
DIVIDERFeature of some spiral notebooks
DIVIDERFiling aid
DIVIDERPartition
DIVIDERRoom partition, e.g.
dividerA person or thing that divides a whole into parts
dividerone that divides (to separate into different parts)
dividerA screen or piece of furniture that divides a room into two parts
dividerA measuring compass, esp. one with a screw for making fine adjustments
dividerAn issue on which opinions are divided