Platform on a stage (5)
I believe the answer is:
riser
(Other definitions for riser that I've seen before include "upright portion of step" , "A bit of a flight" , "One who has stopped sleeping" , "Front of a staircase step" , "Part of flight" .)
I believe the answer is:
riser
(Other definitions for riser that I've seen before include "upright portion of step" , "A bit of a flight" , "One who has stopped sleeping" , "Front of a staircase step" , "Part of flight" .)