Two names are foreign (7)
I believe the answer is:
russian
This clue could be a double definition.
'two names' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'foreign' is the second definition.
Although both the answer and definition are adjectives, I can't understand how one could define the other.
'are' acts as a link.
Can you help me to learn more?
(Other definitions for russian that I've seen before include "St Petersburg native" , "Native of Moscow, say" , "Slavonic tongue" , "Muscovite possibly" , "Type of salad, doll, roulette etc" .)