Earthenware mug (5)
I believe the answer is:
stein
'earthenware mug' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stein that I've seen before include "Gertrude ---; US writer" , "German tankard" , "Beer-mug" , "Inset (anag.)" , "Earthenware beer jug" .)