Crossword Genius

Irregular theme or proposition (7)

Ross

I believe the answer is:

theorem

'proposition' is the definition.
(I know that theorem is a type of proposition)

'irregular theme or' is the wordplay.
'irregular' indicates anagramming the letters.
'theme'+'or'='themeor'
'themeor' anagrammed gives 'THEOREM'.

(Other definitions for theorem that I've seen before include "(Maths) proposition" , "Statement to be proved in maths" , "Proposition not self-evident but proved by a chain of reasoning" , "Proved mathematical hypothesis" , "Proven proposition" .)

I've seen this clue in the Sydney Morning Herald.
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