Get together for prayer (7)
I believe the answer is:
collect
'for prayer' is the definition.
(collect is a type of prayer)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for collect that I've seen before include "Gather; pick up" , "Assemble - a short prayer" , "Assemble or bring together" , "How people in America may be called" , "Come together" .)