Cinerama was of such origin (8)

I believe the answer is:

american

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'of such origin' is the definition.
The definition suggests a singular noun which matches the answer.

'cinerama' is the wordplay.
'cinerama' can be anagrammed to 'AMERICAN'.
Though, I'm not clear how this is indicated.

'was' is the link.

Can you help me to learn more?

(Other definitions for american that I've seen before include "Generic term for one from the New World" , "From the United States" , "- Indian; - football" , "US citizen in Cinerama (8)" , "Person from 9" .)

I've seen this clue in the Evening Standard.

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