Stein moulded in extremely useful vessel (7)
I believe the answer is:
utensil
'vessel' is the definition.
(I've seen this before)
'stein moulded in extremely useful' is the wordplay.
'moulded' is an anagram indicator.
'in' indicates putting letters inside.
'extremely' suggests removing the centre.
'useful' with its centre removed is 'ul'.
'stein' with letters rearranged gives 'tensi'.
'tensi' put inside 'ul' is 'UTENSIL'.
(Other definitions for utensil that I've seen before include "one's employed in the kitchen" , "Gadget" , "Let us in (anag) -- implement" , "A tool for household use" , "Handy kitchen tool" .)