Crossword Genius

Analysed Mother Earth idea (7)

Ross

I believe the answer is:

theorem

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

'analysed mother earth' is the wordplay.
'analysed' indicates anagramming the letters.
'earth' becomes 'E'.
'mother'+'e'='mothere'
'mothere' is an anagram of 'THEOREM'.

(Other definitions for theorem that I've seen before include "Geometric proposition" , "speculation" , "A rule in algebra" , "(Maths) proposition" , "Statement to be proved in maths" .)

I've seen this clue in The Guardian.
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