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In revolution, perhaps, have they a braking effect? (5)

Ross

I believe the answer is:

discs

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for discs that I've seen before include "Type of recordings" , "Flat, thin circular objects" , "Layers of cartilage between vertebrae - they may slip" , "Records" , "They're round and flat" .)

I've seen this clue in the Evening Standard.
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