Communion cup (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
chalice
'communion cup' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for chalice that I've seen before include "Church vessel" , "Necessity for communion" , "Church wine cup" , "Wine cup used at Christian Eucharist" , "Communion cup" .)