Church member has a certain attractiveness (5)
I believe the answer is:
charm
'a certain attractiveness' is the definition.
'charm' can be an answer for 'attractiveness' (charm is a kind of attractiveness). I'm unsure of the 'a certain' bit.
'church member' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'member' becomes 'arm' (member can mean a limb).
'ch'+'arm'='CHARM'
'has' is the link.
Can you help me to learn more?
(Other definitions for charm that I've seen before include "Attractive manner" , "Lure" , "Bracelet ornament" , "Enchant" , "Spell; ornament" .)