He proved drug is the same; host agreed (8)

I believe the answer is:

einstein

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'he proved drug is the same host agreed' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for einstein that I've seen before include "Disney's 14 [GREAT DANE]" , "Physicist who formulated theories of relativity" , "Albert . . . . . . . ., great scientist from nineties" , "Scientist - seen in it (anag)" , "Genius; physicist" .)

I've seen this clue in The Guardian.

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