Sandal strap (5)
I believe the answer is:
thong
'sandal strap' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thong that I've seen before include "Skimpy garment" , "Leather strip that forms the flexible part of a whip: excuse for underwear" , "Skimpy undergarment" , "Sexy strip" , "article of clothing" .)