Crossword Genius

Notably lacking sharpness or flatness (7)

Ross

I believe the answer is:

natural

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This could be a double definition.

'notably lacking sharpness' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

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

'or' is the link.

Can you help me to learn more?

(Other definitions for natural that I've seen before include "Inborn; unaffected" , "Sign on staff" , "character on the staff" , "An ideal person" , "Organic" .)

I've seen this clue in the Evening Standard.
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