Notably lacking sharpness or flatness (7)
I believe the answer is:
natural
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" .)