Unpopular individual, who was never welcome in PTA, arranges noon assembly (7,3,5)
I believe the answer is:
persona non grata
'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" .)