Store window light (4)
I believe the answer is:
neon
(Other definitions for neon that I've seen before include "Noble gas used in illuminated signs" , "Type of lamp" , "Sign gas" , "Type of lighting" , "Element 10, used in lights" .)
I believe the answer is:
neon
(Other definitions for neon that I've seen before include "Noble gas used in illuminated signs" , "Type of lamp" , "Sign gas" , "Type of lighting" , "Element 10, used in lights" .)