Baltic port (4)
I believe the answer is:
riga
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">baltic port</span>' is the definition.<br/ ><span class="explanation-format__explanation">(capital of Latvia, a Baltic nation)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for riga that I've seen before include "trading centre in Latvia" , "Capital city of Latvia" , "Baltic capital city" , "port in Latvia" , "European capital" .)