German beer mug (5)
I believe the answer is:
stein
'german beer mug' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for stein that I've seen before include "German tankard" , "Large earthenware beer mug" , "Inset into earthenware mug for beer" , "Gertrude ---; US writer" , "Beer-mug" .)