Crossword Genius

Fifth Beatle drops off record for Gertrude? (5)

Ross

I believe the answer is:

stein

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'gertrude?' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stein that I've seen before include "Large earthenware beer mug" , "Inset into earthenware mug for beer" , "Inset (anag.)" , "Beer-mug" , "German tankard" .)

I've seen this clue in The Independent.
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