CIA fury unleashed -- concealing personal documents held in trust (9)

I believe the answer is:

fiduciary

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

'held in trust' is the definition.
(thesaurus)

'cia fury unleashed concealing personal documents' is the wordplay.
I cannot really see how this works, but
'documents' could be 'id' (identification) and 'id' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for fiduciary that I've seen is " responsibility".)

I've seen this clue in The Telegraph.

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