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Terribly nasty week for US rapper (5,4)

Ross

I believe the answer is:

kanye west

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'for us rapper' is the definition.
I can't judge whether this definition defines the answer.

'terribly nasty week' is the wordplay.
'terribly' is an anagram indicator.
'nasty'+'week'='nastyweek'
'nastyweek' is an anagram of 'KANYE WEST'.

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I've seen this clue in the Sydney Morning Herald.
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