A Baltic national (7)
I believe the answer is:
latvian
'a baltic national' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for latvian that I've seen before include "Eg, native of Riga" , "republican" , "European national" , "who lives in ex-Communist country?" , "Valiant (anag) - from Riga?" .)