Resonant paragon? That’s quite wrong (7,3,5)

I believe the answer is:

persona non grata

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'resonant paragon? that's quite wrong' is the definition.
I can't tell whether this definition defines the answer.

'resonant paragon? that's quite wrong' is the wordplay.
'that's quite wrong' indicates anagramming the letters.
'resonant'+'paragon'='resonantparagon'
'resonantparagon' is an anagram of 'PERSONA NON GRATA'.

Can you help me to learn more?

(Other definitions for persona non grata that I've seen before include "One banned" , "Undesirable" .)

I've seen this clue in The Independent.

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