Flaw in paragon’s claim? (12)
I believe the answer is:
imperfection
'flaw in paragon's claim?' is the definition.
'imperfection' can be an answer for 'flaw' (I've seen this before). I am not sure about the 'in paragon's claim?' bit.
'flaw in paragon's' is the wordplay.
'flaw in' becomes 'im' (I can't explain this - if you can you should give a lot more credence to this answer).
'paragon' becomes 'perfection' (synonyms).
'im'+'perfection'='IMPERFECTION'
(Other definitions for imperfection that I've seen before include "Fault, flaw" , "Failing" , "Blemish" .)