Religious ritual is arranged, papa's admitted (9)
I believe the answer is:
spiritual
'religious' is the definition.
(I know that religious can be written as spiritual)
'ritual is arranged papa's admitted' is the wordplay.
'arranged' indicates anagramming the letters (letters rearranged).
'papa' becomes 'P' (phonetic alphabet: alpha, bravo, charlie etc.).
'admitted' indicates putting letters inside (inserted letters get admitted).
'ritual'+'is'='ritualis'
'ritualis' is an anagram of 'siritual'.
'siritual' going around 'p' is 'SPIRITUAL'.
(Other definitions for spiritual that I've seen before include "lords" , "Of things of the soul" , "concerning religion" , "Relating to religion" , "Relating to the sacred or the soul" .)