Northern Europeans are a riotous sensation (9)

I believe the answer is:

estonians

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'northern europeans' is the definition.
'Estonians' can be an answer for 'europeans' (people from Estonia). I'm not certain of the 'northern' bit.

'a riotous sensation' is the wordplay.
'a riotous' indicates anagramming the letters.
'sensation' with letters rearranged gives 'ESTONIANS'.

'are' acts as a link.

Can you help me to learn more?

(Another definition for estonians that I've seen is " Europeans".)

I've seen this clue in The Irish Times.

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