Showing nobility, pounds replaced by pair at financial risk (3-5)

I believe the answer is:

sub-prime

'at financial risk' is the definition.
(financial term)

'showing nobility pounds replaced by pair' is the wordplay.
I cannot really understand how this works, but
'pair' could be 'pr' (abbreviation) and 'pr' is found within the answer.
This explanation may well be incorrect...

I've seen this clue in The Times.

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