Alien from Ancient Rome (7,3,5)
I believe the answer is:
persona non grata
'alien' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
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 Telegraph.
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