A German beer mug for eminent scientist (8)

I believe the answer is:

einstein

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

'eminent scientist' is the definition.
'einstein' can be an answer for 'scientist' (Einstein is an example). I'm not certain of the 'eminent' bit.

'a german beer mug' is the wordplay.
'a german' becomes 'ein' ('a' in German).
'beer mug' becomes 'stein' (synonyms).
'ein'+'stein'='EINSTEIN'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for einstein that I've seen before include "Albert . . . . . . . . founder of theory of relativity" , "Bright chap" , "Albert, who founded the theory of relativity" , "Nineties (anag.)" , "E=mc2 physicist" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.