Not really confident about urn use (6)

I believe the answer is:

unsure

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'not really confident' is the definition.
I can't tell whether this definition defines the answer.

'about urn use' is the wordplay.
'about' indicates anagramming the letters.
'urn'+'use'='urnuse'
'urnuse' with letters rearranged gives 'UNSURE'.

Can you help me to learn more?

(Other definitions for unsure that I've seen before include "Far from certain" , "Not certain, doubtful" , "Hesitant" , "Not certain or decided" , "regarded as somewhat precarious" .)

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

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