German blend of wine seen as capital by Austrians (4)

I believe the answer is:

wien

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'german blend' is the definition.
The definition suggests a singular noun which matches the answer.

'wine seen as capital by austrians' is the wordplay.
'wine' can be anagrammed to 'WIEN'.
Though, I am not sure how this is indicated.

'of' is the link.

Can you help me to learn more?

(Another definition for wien that I've seen is " European capital for Germans".)

I've seen this clue in the Evening Standard.

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