Question — shoe (4)
I believe the answer is:
pump
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">question</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that pump is a more specific form of the action question)</span><br/ ><br/ >'<span class="explanation-format__original">shoe</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that Pump is a pump)</span><br/ ><br/ ></span>
(Other definitions for pump that I've seen before include "Flat shoe; siphon" , "Compressor, light shoe" , "The heart is one" , "ask a lot of questions" , "Fluid moving device" .)