Sizable server (3)
I believe the answer is:
urn
'sizable server' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for urn that I've seen before include "Funereal vase" , "Water vessel" , "a large vase as for cremation ashes" , "Large pot for coffee or tea" , "Ornamental vessel" .)