I'm one so horribly unpleasant (7)

I believe the answer is:

noisome

'unpleasant' is the definition.
(I've seen this before)

'i'm one so horribly' is the wordplay.
'horribly' indicates anagramming the letters.
'im'+'one'+'so'='imoneso'
'imoneso' with letters rearranged gives 'NOISOME'.

(Other definitions for noisome that I've seen before include "Extremely unpleasant" , "Offensively smelly" , "Smelling badly" , "Stinking" , "Harmful to health; disgusting" .)

I've seen this clue in The Sun.

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