Stone circles one by one revealing Uralic language (8)
I believe the answer is:
estonian
'uralic language' is the definition.
(Estonian is an example)
'stone circles one by one' is the wordplay.
'circles' is an anagram indicator.
'one' becomes 'i' (Roman numeral).
'by' is a charade indicator (letters next to each other).
'one' becomes 'an' (an apple is one apple).
'stone' anagrammed gives 'eston'.
'eston'+'i'+'an'='ESTONIAN'
'revealing' is the link.
(Other definitions for estonian that I've seen before include "From one of the three Baltics" , "Native of a Baltic republic" , "One from Tallinn" , "Native of Tallinn, say" , "Person from Tallinn, say." .)