Spanish seaport (5)
I believe the answer is:
cadiz
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spanish seaport</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cadiz that I've seen before include "Where Drake burned the Spanish fleet" , "European port" , "Southwest Spanish port" , "SW Spanish port" , "Old Spanish port" .)