Save worthless urn (4)

I believe the answer is:

vase

I'm a little stuck... Click here to teach me more about this clue!

'urn' is the definition.
(I've seen this before)

'save worthless' is the wordplay.
'save' anagrams to 'VASE'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for vase that I've seen before include "Ornament for flowers" , "Flower holder" , "Flower container - save it" , "Receptacle for flowers - save it" , "Holder for flowers" .)

I've seen this clue in the Sydney Morning Herald.

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