It's seen in drunken brainiacs (9)

I believe the answer is:

einsteins

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'brainiacs' is the definition.
I can't tell whether this definition defines the answer.

'it's seen in drunken' is the wordplay.
'drunken' is an anagram indicator.
'its'+'seen'+'in'='itsseenin'
'itsseenin' with letters rearranged gives 'EINSTEINS'.

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(Another definition for einsteins that I've seen is " Geniuses".)

I've seen this clue in The Independent.

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