Crossword Genius

Vertical in a staircase (5)

Ross

I believe the answer is:

riser

(Other definitions for riser that I've seen before include "Stair front" , "one of a number in flight" , "Upright part of step - vertical pipe" , "Front of a staircase step" , "Vertical upward pipe" .)

I've seen this clue in The Times.
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