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Prominent scientist, not a German mug (5)

Ross

I believe the answer is:

stein

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'german mug' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for stein that I've seen before include "Inset (anag.)" , "Gertrude __, avant-garde US author, d. 1946" , "Gertrude ---; US writer" , "German earthenware beer mug" , "German tankard" .)

I've seen this clue in The Independent.
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