Dispersion of people from their homeland (8)
I believe the answer is:
diaspora
'dispersion of people from their homeland' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for diaspora that I've seen before include "The dispersion of Jews throughout the world" , "Jews outside Israel" , "Great dispersion of people, Jews or Irish" , "The dispersal of a people" , "The scattering of a people from the same home country" .)