Crossword Genius

How to sound lower class (6)

Ross

I believe the answer is:

lesson

I'm a little stuck... Click here to teach me more about this clue!

'class' is the definition.
(I've seen this before)

'how to sound lower' is the wordplay.
I cannot really see how this works, but
'lower' could be 'less' (synonyms) and 'less' is present in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for lesson that I've seen before include "15 down period" , "corrective punishment" , "Teaching unit" , "Moral" , "Teaching session or reading from Bible" .)

I've seen this clue in The Sunday Times.
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