Dunce sure to arrange risky loan (9)

I believe the answer is:

unsecured

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'risky loan' is the definition.
'unsecured' can be an answer for 'loan' (thesaurus). I am not certain of the 'risky' bit.

'dunce sure to arrange' is the wordplay.
'to arrange' indicates an anagram.
'dunce'+'sure'='duncesure'
'duncesure' with letters rearranged gives 'UNSECURED'.

Can you help me to learn more?

(Other definitions for unsecured that I've seen before include "on the loose" , "liable to come off" , "Not locked" .)

I've seen this clue in The Daily Express.

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