Come together; gather (8)
I believe the answer is:
assemble
This clue is a double definition.
'come together' is the first definition.
(I've seen this in another clue)
'gather' is the second definition.
(I know that gather can be written as assemble)
(Other definitions for assemble that I've seen before include "Bring/come together" , "Manufacture" , "Come or bring group together" , "Gather together in one place" , "Bring or gather together" .)