Economic (9)
I believe the answer is:
efficient
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">economic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for efficient that I've seen before include "Effective in doing what is required" , "Functioning effectively" , "Not wasting energy" , "working economically at speed" , "Performing with little wastage" .)