Caterer's pot (3)
I believe the answer is:
urn
'caterer's pot' 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 "Source of tea" , "Water vessel" , "One carrying coffee or tea" , "Vase-shaped vessel" , "Spore-producing capsule of a moss" .)