Costa del Sol resort (6)
I believe the answer is:
malaga
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">costa del sol resort</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 malaga that I've seen before include "Spanish city and holiday resort" , "City of Andalusia" , "Andalusian port; wine" , "Army rank; not shared" , "Resort in Andalusia" .)