Two names written in a foreign language (7)
I believe the answer is:
russian
'language' is the definition.
(I know that Russian is a type of Slavic)
'two names written in a foreign' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' 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 russian that I've seen before include "Slavic language" , "Native of St Petersbourg, say" , "Native of the world's largest country" , "East European" , "Muscovite, maybe" .)