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The record's discernibly reduced (4)

Ross

I believe the answer is:

disc

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'the record's' is the definition.
(eg a CD, compact disc)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for disc that I've seen before include "One of 33, 45 or 78?" , "Old record" , "Spine cartilage layer" , "Back part" , "'Round, flat shape (4)'" .)

I've seen this clue in the Evening Standard.
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