Theater usher's illumination (10)
I believe the answer is:
flashlight
(Other definitions for flashlight that I've seen before include "One beams brightly" , "It may be needed to see" , "shiner" , "Electric torch" , "that's illuminating" .)
I believe the answer is:
flashlight
(Other definitions for flashlight that I've seen before include "One beams brightly" , "It may be needed to see" , "shiner" , "Electric torch" , "that's illuminating" .)