Plates so arranged for Last Supper invitees (8)
I believe the answer is:
apostles
'last supper invitees' is the definition.
'plates so arranged' is the wordplay.
'arranged' indicates an anagram.
'plates'+'so'='platesso'
'platesso' is an anagram of 'APOSTLES'.
'for' is the link.
(Other definitions for apostles that I've seen before include "The Twelve - or a Cambridge society" , "Twelve disciples chosen by Christ" , "Early Christians" , "They were sent by Christ to teach the Gospel" , "Jesus's disciples" .)