Rubber overshoe (6)
I believe the answer is:
galosh
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rubber overshoe</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 galosh that I've seen before include "Wellington" , "Rubber overshoe" , "Waterproof shoe" , "singular footwear" , "Waterproof overshoe" .)