His curate screwed up sacrament (9)
I believe the answer is:
eucharist
'sacrament' is the definition.
(Eucharist is an example)
'his curate screwed up' is the wordplay.
'screwed up' indicates an anagram.
'his'+'curate'='hiscurate'
'hiscurate' anagrammed gives 'EUCHARIST'.
(Other definitions for eucharist that I've seen before include "Consecrated bread" , "Bread and wine" , "host" , "Holy Communion" , "church service" .)