Crossword Genius

One of standard whiteness? (5)

Ross

I believe the answer is:

sheet

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This could be a double definition.

'one of standard' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

'whiteness?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

Can you help me to learn more?

(Other definitions for sheet that I've seen before include "Piece of paper; nautical rope" , "Large piece of fabric" , "Piece of paper or bedding" , "Page of postage stamps" , "newspaper" .)

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