Curate and his unconventional liturgy (9)
I believe the answer is:
eucharist
'liturgy' is the definition.
'curate and his unconventional' is the wordplay.
'and' says to put letters next to each other (I've seen this in other clues).
'unconventional' is an anagram indicator.
'curate' put after 'his' is 'hiscurate'.
'hiscurate' anagrammed gives 'EUCHARIST'.
(Other definitions for eucharist that I've seen before include "host" , "Holy Communion" , "Consecrated bread" , "church service" , "Mass" .)