Get together for prayer (7)
I believe the answer is:
Here is my best explanation:
This clue is a triple definition!
'get' is the first definition.
(collecting is a kind of getting)
'together' is the second definition.
'for' is a link.
'prayer' is the third definition.
(collect is a type of prayer)
(Other definitions for collect that I've seen before include "Assemble - a short prayer", "Assemble or bring together", "Gather; pick up", "mass", "Amass; a prayer", "Bring together", "Raise", "Pick up - part of service", "How people in America may be called" and "Short prayer".)