Gathering of old friends (7)
I believe the answer is:
reunion
'gathering of old friends' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for reunion that I've seen before include "Gathering of old friends, colleagues etc" , "Get-together after long separation" , "French island near Mauritius" , "part of France" , "Meet-up of old friends" .)