Church girl provides communion cup (7)
I believe the answer is:
chalice
'communion cup' is the definition.
(I've seen this before)
'church girl' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'girl' becomes 'alice' (girl's nae).
'ch'+'alice'='CHALICE'
'provides' is the link.
(Other definitions for chalice that I've seen before include "Large goblet for consecrated wine" , "Eucharistic cup" , "Cup used in church" , "Necessity for communion" , "bowl" .)