Rubber-soled sandal (5)

I believe the answer is:

thong

(Other definitions for thong that I've seen before include "Narrow strip of leather as lash" , "Skimpy underwear" , "Strap - strip" , "Leather strip that forms the flexible part of a whip: excuse for underwear" , "Leather strip fastener" .)

I've seen this clue in the Sydney Morning Herald.

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