Save up for an urn (4)
I believe the answer is:
vase
'an urn' is the definition.
(I've seen this in another clue)
'save up' is the wordplay.
'up' is an anagram indicator (letters get chucked up).
'save' is an anagram of 'VASE'.
'for' acts as a link.
(Other definitions for vase that I've seen before include "Ornamental vessel (for flowers etc)" , "Save in container for flowers" , "Cut flower container" , "Open jar for holding flowers" , "Flower container - save it" .)