Tool; old saying (3)
I believe the answer is:
saw
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">tool</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that saw is a type of power tool)</span><br/ ><br/ >'<span class="explanation-format__original">old saying</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for saw that I've seen before include "A maxim with teeth" , "The saying for cutting wood" , "Perceived visually" , "Understood" , "Grasped" .)