Crossword Genius

Level of tone not softly played is an irritation (4)

Ross

I believe the answer is:

itch

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'irritation' is the definition.
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(Other definitions for itch that I've seen before include "Hunger, longing" , "Prickling" , "Irritating sensation on skin" , "Nagging wish" , "A nagging desire" .)

I've seen this clue in The Telegraph.
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