Crossword Genius

Article more about proposition (7)

Ross

I believe the answer is:

theorem

'proposition' is the definition.
(theorem is a kind of proposition)

'article more about' is the wordplay.
'article' becomes 'the' (the definite article in English).
'about' is an anagram indicator.
'more' is an anagram of 'orem'.
'the'+'orem'='THEOREM'

(Other definitions for theorem that I've seen before include "Proof" , "Proved mathematical hypothesis" , "Statement to be proved in maths" , "this has been established" , "The more it changed to a proposition to be proved" .)

I've seen this clue in The Mirror and The Daily Express.
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