Crossword Genius

Something on the windscreen (5)

Ross

I believe the answer is:

wiper

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'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" .)

I've seen this clue in the Evening Standard.
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