Part of mathematics test beneath George and myself (8)
I believe the answer is:
geometry
'part of mathematics' is the definition.
(I know this)
'test beneath george and myself' is the wordplay.
'test' becomes 'try' (synonyms).
'beneath' means one lot of letters go next to another (in a down clue).
'george' becomes 'geo'.
'and' is a charade indicator (letters next to each other).
'myself' becomes 'me'.
'geo'+'me'='geome'
'try' put after 'geome' is 'GEOMETRY'.
Can you help me to learn more?
(Other definitions for geometry that I've seen before include "Mathematics of points, lines, curves and surfaces" , "Euclid's science" , "'Mathematics of points, lines and surfaces (8)'" , "Maths dealing with lines, angles etc - Euclid was good at it" , "school subject" .)