Crossword Genius

The sound of a piano is excruciating (5)

Ross

I believe the answer is:

noise

'the sound' is the definition.
(a noise is a sound)

'of a piano is excruciating' is the wordplay.
'of' indicates a hidden word.
'NOISE' is hidden within 'piano is excruciating'.

(Other definitions for noise that I've seen before include "Rumour" , "Loud sound; bruit" , "Clamour" , "Sound of any kind" , "Row" .)

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