Coffee dispenser (3)
I believe the answer is:
'coffee dispenser' 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 "Run to get large vase" , "Huge teapot" , "A large vase as for human ashes" , "Vessel for tea or ashes" , "Tall stemmed vase" .)