No swearing about these descendants of the Vikings? (10)

I believe the answer is:

norwegians

I'm a little stuck... Click here to teach me more about this clue!

'these descendants of the vikings?' is the definition.
The definition suggests an adverb but the answer is not.

'no swearing about' is the wordplay.
'about' is an anagram indicator.
'swearing' is an anagram of 'rwegians'.
'no'+'rwegians'='NORWEGIANS'

Can you help me to learn more?

(Another definition for norwegians that I've seen is " Nationals".)

I've seen this clue in The Times.

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