Extempore performance pieces depict urns (10)

I believe the answer is:

unscripted

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'extempore performance pieces depict urns' is the definition.
I can't judge whether this defines the answer.

'pieces depict urns' is the wordplay.
'pieces' indicates an anagram (I've seen 'pieces of' mean this (I've seen this in other clues)).
'depict'+'urns'='depicturns'
'depicturns' with letters rearranged gives 'UNSCRIPTED'.

Can you help me to learn more?

(Other definitions for unscripted that I've seen before include "off the cuff" , "Impromptu" , "unexpected" .)

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

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