Russians heading off with Europeans (8)
I believe the answer is:
iberians
'europeans' is the definition.
(the Iberian peninsula is part of Europe)
'russians heading off' is the wordplay.
'russians' becomes 'Siberians' (Siberian is an example).
'heading off' means to remove the first letter.
'siberians' with its first letter taken off is 'IBERIANS'.
'with' acts as a link.
(Other definitions for iberians that I've seen before include "People from a peninsular" , "They come from Spain and Portugal" , "Western Europeans" , "Inhabitants of peninsula comprising Spain and Portugal" , "People of Spain and Portugal" .)