Latvian or Lithuanian (4)
I believe the answer is:
balt
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">latvian</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(someone from a Baltic nation)</span><br/ ><br/ >'<span class="explanation-format__original">lithuanian</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(someone from a Baltic nation)</span><br/ ><br/ ></span>
(Other definitions for balt that I've seen before include "eg Latvian" , "European" .)