Article has more about this logically deduced proposition (7)
I believe the answer is:
theorem
'proposition' is the definition.
(I know that theorem is a type of proposition)
'article has more about this logically deduced' is the wordplay.
I cannot quite understand how this works, but
'article' could be 'the' (the definite article in English) and 'the' is located in the answer.
an anagram of 'more' is 'orem' which is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for theorem that I've seen before include "Mathematical statement to be proved" , "The more it changed to a proposition to be proved" , "Proven proposition" , "deduction" , "Mathematical rule" .)