Crossword Genius

In Munich, a mug? Not I (8)

Ross

I believe the answer is:

einstein

I'm a little stuck... Click here to teach me more about this clue!

'not i' is the definition.
Although both the answer and definition are adjectives, I can't understand how they can define each other.

'in munich a mug?' is the wordplay.
'in munich' becomes 'ein' (I can't explain this - if you can you should believe this answer much more).
'a mug?' becomes 'stein' (stein is a kind of mug).
'ein'+'stein'='EINSTEIN'

Can you help me to learn more?

(Other definitions for einstein that I've seen before include "Albert . . . . . . . . founder of theory of relativity" , "Scientist - seen in it (anag)" , "German-born physicist" , "Scientific genius" , "Albert . . . . . . . ., great scientist from nineties" .)

I've seen this clue in The Telegraph.
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