Crossword Genius

Member of the most numerous ethnic and linguistic peoples in Europe (4)

Ross

I believe the answer is:

slav

(Other definitions for slav that I've seen before include "Person speaking one of related languages of Euro-Asian border" , "Eastern European" , "European perhaps" , "Native of eastern Europe, perhaps" , "A Russian, say" .)

I've seen this clue in The Guardian.
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