Crossword Genius

Unpopular individual, who was never welcome in PTA, arranges noon assembly (7,3,5)

Ross

I believe the answer is:

persona non grata

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'unpopular individual who was never welcome' is the definition.
I can't judge whether this defines the answer.

'pta arranges noon assembly' is the wordplay.
'assembly' is an anagram indicator.
'pta'+'arranges'+'noon'='ptaarrangesnoon'
'ptaarrangesnoon' with letters rearranged gives 'PERSONA NON GRATA'.

'in' acts as a link.

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 Irish Times.
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