It's your turn, we're told, to toil endlessly ahead of South Balkans race (9)
I believe the answer is:
yugoslavs
'we're told to toil endlessly ahead of south balkans race' is the definition.
I can't judge whether this defines the answer.
'it's your turn' is the wordplay.
I cannot quite see how this works, but
'turn' could be 'go' (a person's move in a board game) and 'go' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for yugoslavs that I've seen before include "old country folk" , "Serbs" .)