Persona non grata forbidden to go on pitch (7)
I believe the answer is:
outcast
'persona non grata' is the definition.
(thesaurus)
'forbidden to go on pitch' is the wordplay.
'forbidden' becomes 'out' (synonyms).
'to go on' is a charade indicator (letters next to each other) (in a down clue, some letters go on top of others).
'pitch' becomes 'cast' (I've seen this before).
'out'+'cast'='OUTCAST'
(Other definitions for outcast that I've seen before include "Derelict" , "Displaced person" , "Exile" , "He has been evicted from society" , "one sent to Coventry" .)