A riot commencing somehow, an irritation for nationalists (8,7)

I believe the answer is:

economic migrant

'an irritation for nationalists' is the definition.

'a riot commencing somehow' is the wordplay.
'somehow' is an anagram indicator.
'a'+'riot'+'commencing'='ariotcommencing'
'ariotcommencing' anagrammed gives 'ECONOMIC MIGRANT'.

I've seen this clue in The Guardian.

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