Standard illumination? (4)
I believe the answer is:
lamp
This clue could be a double definition.
'standard' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'illumination?' is the second definition.
Can you help me to learn more?
(Other definitions for lamp that I've seen before include "Artificial source of illumination" , "punch" , "Florence Nightingale was the Lady with the . . . ." , "This could be standard" , "Source of light, usually portable" .)