Crossword Genius

Not so much advanced education (6)

Ross

I believe the answer is:

lesson

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'education' is the definition.
(lesson is a kind of education)

'not so much advanced' is the wordplay.
'not so' becomes 'less' (eg 'not so big' means 'less big').
'much advanced' becomes 'on' (I can't justify this - if you can you should believe this answer much more).
'less'+'on'='LESSON'

Can you help me to learn more?

(Other definitions for lesson that I've seen before include "School period" , "Reading or exercise for a pupil" , "Portion of instruction" , "Teaching session or reading from Bible" , "Church reading" .)

I've seen this clue in the Evening Standard.
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