Thong (5)
I believe the answer is:
strap
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thong</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 strap that I've seen before include "Belt; leather strip" , "Parts of a long piece of leather" , "Strong band for binding luggage etc" , "Narrow strip of leather" , "Parts (anag.)" .)