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Irritation of one in short sleepover (4)

Ross

I believe the answer is:

pain

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'irritation' is the definition.
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(Other definitions for pain that I've seen before include "nuisance to be put up with" , "Suffering of body or mind" , "Mental distress" , "Symptom of hurt or disorder" , "Unpleasant sensation" .)

I've seen this clue in The Guardian.
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