Grandiloquent way of describing the soprano voice (4-8)

I believe the answer is:

high-sounding

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'grandiloquent' is the definition.
(thesaurus)

'way of describing the soprano voice' is the wordplay.
I cannot really understand how this works, but
'way' could be 's' (Compass direction - South) and 's' is found in the answer.
'of' could be 'o' and 'o' is located in the answer.
'soprano' could be 'high' (similar in meaning) and 'high' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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