Unconventional nineties genius (8)

I believe the answer is:

einstein

'genius' is the definition.
(I've seen this before)

'unconventional nineties' is the wordplay.
'unconventional' indicates an anagram.
'nineties' anagrammed gives 'EINSTEIN'.

(Other definitions for einstein that I've seen before include "Nobel prize-winner" , "Disney's 14 [GREAT DANE]" , "Father of Relativity" , "renowned scientist" , "Scientific genius" .)

I've seen this clue in The Guardian.

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