Luanda is its capital city (6)
I believe the answer is:
angola
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">luanda is its capital city</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for angola that I've seen before include "West African country" , "SW African republic, capital Luanda" , "Republic of SW Africa" , "It's no gala in this African country" , "SW African country" .)