Crossword Genius

Vertical part of a step (5)

Ross

I believe the answer is:

riser

(Other definitions for riser that I've seen before include "One on the way up" , "Vertical piece between two stair treads" , "Upright part of step - vertical pipe" , "One who has stopped sleeping" , "found on the staircase" .)

I've seen this clue in the Sydney Morning Herald and The Irish Times.
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