Make more efficient (10)
I believe the answer is:
streamline
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make more efficient</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for streamline that I've seen before include "run things more efficiently" , "Get more efficient" , "Improve efficiency" , "eliminate resistance" , "Increase efficiency" .)