Swimsuit (6)
I believe the answer is:
bikini
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swimsuit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(bikini is a kind of swimsuit)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bikini that I've seen before include "Two piece swimsuit" , "Brief two-piece swimming costume" , "tests were carried out here" , "bomb site" , "Small bathing costume or atoll in Marshall Islands" .)