Extremely angry, hide statements of debts (7)

I believe the answer is:

furious

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

'hide statements of debts' is the wordplay.
'hide' becomes 'fur' (animal fur).
'statements of debts' becomes 'ious' (I can't justify this - if you can you should give a lot more credence to this answer).
'fur'+'ious'='FURIOUS'

Can you help me to learn more?

(Other definitions for furious that I've seen before include "at boiling point" , "Raging" , "Seeing red" , "Extremely angry" , "Livid" .)

I've seen this clue in The Telegraph.

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