Magic spell revealed by church member (5)
I believe the answer is:
charm
'magic spell' is the definition.
(thesaurus)
'church member' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'member' becomes 'arm' (member can mean a limb).
'ch'+'arm'='CHARM'
'revealed by' acts as a link.
(Other definitions for charm that I've seen before include "Win over" , "small ornament" , "Appeal; trinket" , "Delightfulness" , "Greatly delight" .)