Meg tore out unknown bit of maths (8)

I believe the answer is:

geometry

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'bit of maths' is the definition.
'geometry' can be an answer for 'maths' (geometry is a kind of maths). I am not certain of the 'bit of' bit.

'meg tore out unknown' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'unknown' becomes 'y' (algebra).
'meg'+'tore'='megtore'
'megtore' with letters rearranged gives 'geometr'.
'geometr'+'y'='GEOMETRY'

Can you help me to learn more?

(Other definitions for geometry that I've seen before include "Euclid's science" , "school subject" , "Branch of maths associated with Euclid" , "Mathematics of shapes and lines" , "Mathematics of points, lines etc." .)

I've seen this clue in The Daily Express.

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