ME citizen is supported by artist and priest (7)
I believe the answer is:
israeli
'me citizen' is the definition.
(I've seen this before)
'is supported by artist and priest' is the wordplay.
'supported by' is a charade indicator (letters next to each other) (letters go below - in down clue).
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'and' means one lot of letters go next to another.
'priest' becomes 'eli' (I've seen this before).
'is'+'ra'+'eli'='ISRAELI'
(Other definitions for israeli that I've seen before include "Citizen of a country 'born' in 1948" , "Relating to a Mediterranean nation" , "A Middle-Easterner" , "Citizen of Middle Eastern state" , "of the Levant?" .)