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Authentic roasted grain oil (8)


I believe the answer is:


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'authentic' is the definition.

'roasted grain oil' is the wordplay.
'grain oil' can be anagrammed to 'ORIGINAL'.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for original that I've seen before include "Creative, new in design" , "Not derived or copied form something else" , "Phototype" , "The first, not a copy" , "Not an imitation, the first" .)

I've seen this clue in the Sydney Morning Herald.
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