Crossword Genius

Total wizard coda to Schoenberg keeps Transfigured Night showing brilliance of Proms season (6,9)

Ross

I believe the answer is:

summer lightning

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

'total wizard coda to schoenberg keeps transfigured night showing brilliance of proms season' is the definition.
I can't tell whether this defines the answer.

'total wizard coda to schoenberg keeps transfigured night' is the wordplay.
I cannot really understand how this works, but
'total' could be 'sum' (synonyms) and 'sum' is found within the answer.
an anagram of 'night' is 'ightn' which is present in the answer.
'wizard' could be 'merlin' (I've seen this before) and 'merlin' is present in the remaining letters.
A single letter 'g' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Times.
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