Mudguard (6)
I believe the answer is:
fender
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mudguard</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fender that I've seen before include "Fire- or wheel-guard" , "Feature of vehicle from 24 [US SAY]" , "Boat's impact protector" , "Hearth-guard" , "On a boat, it's protects against impact" .)