Crossword Genius

Vertical stair component (5)

Ross

I believe the answer is:

riser

(Other definitions for riser that I've seen before include "Vertical part of a stair or step" , "Upright piece between steps" , "found on the staircase" , "One on the way up" , "Person getting out of bed" .)

I've seen this clue in the Universal.
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