Oktoberfest vessel (5)
I believe the answer is:
stein
'oktoberfest vessel' 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 "Glass" , "Gertrude ---; US writer" , "German earthenware beer mug" , "Inset (anag.)" , "Gertrude __, avant-garde US author, d. 1946" .)