Disciplinary record? (4)

I believe the answer is:

disc

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'record?' is the definition.
('disc' can be a synonym of 'record')

I cannot understand how the remainder of the clue works.

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(Other definitions for disc that I've seen before include "In Olympic event" , "counter" , "Flat thin circular body" , "Body without limbs" , "Sound recording" .)

I've seen this clue in the Evening Standard.

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