Page on king and member of the clergy (6)
I believe the answer is:
rector
'member of the clergy' is the definition.
(I've seen this before)
'page on king' is the wordplay.
'page' becomes 'recto' (recto is a kind of page).
'on' is a charade indicator (letters next to each other).
'king' becomes 'r' (r is abbreviation for rex).
'recto'+'r'='RECTOR'
'and' acts as a link.
(Other definitions for rector that I've seen before include "Vicar" , "Parish priest" , "Parson" , "Church official" , "Cleric" .)