Scattering of an ethnic group (8)
I believe the answer is:
diaspora
'scattering of an ethnic group' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for diaspora that I've seen before include "The scattering of a nation's people" , "Scattering in exile" , "race round the world" , "Scattered group" , "Great dispersion of people, Jews or Irish" .)