Come together; Eucharist (4)
I believe the answer is:
mass
I believe this clue is a double definition.
'come together' is the first definition.
(I've seen this in another clue)
'eucharist' is the second definition.
(I've seen this before)
(Other definitions for mass that I've seen before include "RC ceremony" , "The proletariat" , "Quantity; religious service" , "Celebration of the Eucharist, especially in the RC Church" , "Rite; quantity of matter" .)