Titled lady in Italy one casts out (8)
I believe the answer is:
contessa
'titled lady in italy' is the definition.
I know nothing about this answer so I can't tell whether this works.
'one casts out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'one'+'casts'='onecasts'
'onecasts' anagrammed gives 'CONTESSA'.
Can you help me to learn more?
(Other definitions for contessa that I've seen before include "European noblewoman" , "Italian noblewoman" , "Italian lady" , "foreign noblewoman" , "noble foreign lady" .)