Church member, for a spell (5)
I believe the answer is:
charm
'a spell' is the definition.
(I've seen this before)
'church member' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'member' becomes 'arm' (arm is a kind of member).
'ch'+'arm'='CHARM'
'for' is the link.
(Other definitions for charm that I've seen before include "Group of goldfinches" , "Appeal; trinket" , "Spell; ornament" , "Engaging quality" , "Bewitch or delight" .)