They are used in driving rain (6)

I believe the answer is:

wipers

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'they' is the definition.
Both the definition and answer are plural nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for wipers that I've seen before include "Cleaners of windscreen" , "Cleaning devices" , "Ypres (WW1 sl.)" , "Rubber blades for cleaning car windows" .)

I've seen this clue in The Irish Independent.

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