Greatly delight church member (5)
I believe the answer is:
charm
'greatly delight' 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'
(Other definitions for charm that I've seen before include "Power of fascination" , "small ornament" , "Entrance, bewitch" , "Engaging quality" , "Win over" .)