Crossword Genius

Article more about idea (7)

Ross

I believe the answer is:

theorem

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

'article more about' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'about' indicates anagramming the letters.
'more' with letters rearranged gives 'orem'.
'the'+'orem'='THEOREM'

(Other definitions for theorem that I've seen before include "(Maths) proposition" , "A rule in algebra" , "Geometrical proposition to be proved" , "Algebraic rule" , "Mathematical proposition proved by reasoning" .)

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