You, say, search it frantically for the sacrament (9)
I believe the answer is:
eucharist
'sacrament' is the definition.
(I know that Eucharist is a sacrament)
'you say search it frantically' is the wordplay.
'you say' becomes 'u' ('you' as it sounds).
'frantically' indicates an anagram.
'u'+'search'+'it'='usearchit'
'usearchit' with letters rearranged gives 'EUCHARIST'.
'for the' acts as a link.
(Other definitions for eucharist that I've seen before include "church service" , "Mass" , "Holy Communion" , "Consecrated bread" , "host" .)