Muscovite, say (7)
I believe the answer is:
russian
'muscovite say' is the definition.
(muscovite is a kind of Russian)
This is the entire clue.
(Other definitions for russian that I've seen before include "Putin's language" , "St Petersburg native" , "Muscovite, maybe" , "Native of St Petersbourg, say" , "Eg, Moscow native" .)