"Come ____" (8)
'come' is the definition.
(I know that come can be written as arrive)
This is all the clue.
(Other definitions for arrive that I've seen before include "Come to; succeed" , "Reach destination or achieve success" , "To gain recognition" , "Make it" , "Show up" .)
(Other definitions for together that I've seen before include "Collected" , "as a group" , "In one another's company" , "On the trot" , "in concert" .)