Something on the windscreen (5)
I believe the answer is:
wiper
'windscreen' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for wiper that I've seen before include "someone drying off?" , "Maybe sponge" , "Window-cleaner" , "Moving electrical contact" , "Feature of car" .)