Growing approval about an article (3)
I believe the answer is:
oak
'growing' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'approval about an article' is the wordplay.
'approval' becomes 'ok' (OK is an example).
'about' is an insertion indicator.
'an article' becomes 'a' (the indefinite article in English).
'ok' enclosing 'a' is 'OAK'.
Can you help me to learn more?
(Other definitions for oak that I've seen before include "Strong hardwood" , "The King of the Forest" , "Grown acorn" , "Tree of the genus Quercus" , "Acorn-bearing tree" .)