Crossword Genius

Vertical part of a stair (5)

Ross

I believe the answer is:

riser

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vertical part of a stair</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for riser that I've seen before include "an essential to flight" , "Vertical piece between treads of staircase" , "Vertical upward pipe" , "Vertical pipe; staircase part" , "One who has stopped sleeping" .)

I've seen this clue in The Times.
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