Racial (6)
I believe the answer is:
ethnic
'racial' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ethnic that I've seen before include "Relating to cultural groups" , "Of the distinct ways of living of a particular group of people" , "Relating to a particular racial group" , "To do with race or nationality" , "Relating to a particular culture" .)