Purpose; employ (3)
I believe the answer is:
use
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">purpose</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">employ</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for use that I've seen before include "Milk" , "Habitually employ" , "Exploit unfairly" , "Employ or exploit" , "Resort to - operation" .)