Crossword Genius

It's just the same as what is put on disc (8)

Ross

I believe the answer is:

identity

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'disc' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for identity that I've seen before include "papers" , "Absolute sameness; personality" , "Uniqueness" , "Individuality, personality" , "It's on the cards" .)

I've seen this clue in The Globe and Mail.
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