Crossword Genius

Fashionable class, Old Norse, to sell out (6,2)

Ross

I believe the answer is:

inform on

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'sell out' is the definition.
(thesaurus)

'fashionable class old norse' is the wordplay.
'fashionable' becomes 'in' (similar in meaning).
'class' becomes 'form' (synonyms).
'old norse' becomes 'on' (this might be a standard abbreviation which I don't know about).
'in'+'form'+'on'='INFORM ON'

'to' is the link.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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