Plimsolls (5)
I believe the answer is:
pumps
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">plimsolls</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 pumps that I've seen before include "Forces liquid to move; light shoes" , "footwear" , "Mechanical devices that move fluid or gas" , "needed by cyclists" , "Cycle attachments" .)